Im basically in the process of breaking my modded 305 TPI, Bascially all the sensors and relays are brand new except for some, but lately i've been noticing the car hesitating while i shift different gears, sometimes its not so bad then sometimes its very noticeable and annoying, this never happened the motor has about 350 miles on it and this problem started 4 days ago? i noticed the idling has become very weak. When i shift off to the next gear it feels as if its running out of gas, but i know theres gas its full. About friday when i went to the gas station, and left the car running(reason i left car running is headers are too close to starter if i shut off car wont start till cooled, need header wrap)while i took out the gas cap the cars idle went down and it shut off?? what could this mean?? Im more concerned with the hesitation, i have a brand new fuel pump, its working, ford 19lb injectors,tuneup all have about same miles as rebuilt motor????? Please help me with this hesitating problem. Just so u know i dont have a aftermarket fuel pressure regulator im using the stock one.

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92' camaro
New 305 block TPI conversion, Flat top pistons,Bore over .30 Forged parts all around,Edelbrock intake,ported plennum,ported corvette alluminum heads, accel cam,52mm throttle bodie, SLP runners Home aid cold air induction, Air foil,ford SVO 19lb injectors,fuel regulator,cloys timing chain, comp alluminum roller rocker arms and pushrods MSD 8.5 mm wires, bosch plattinum plugs, hypertech cap & rotor and coil, Edelbrock TES headers, free flowing catalytic converter and a 3 inch force II flowmaster exhaust system, and a 3 inch cutout,Zoom multi friction clutch, T-5 tranny,billenstien shocks&struts.
Soon to come!!!
Procharger system 12lbs o boost.
New paint job(hawaiin orchid purple)Cast alluminum ZR1 rims w/ 275 tires.
site to see my cars at <A HREF="http://www.geocities.com/iroc_dis/iroc_dis_page.html

1971" TARGET=_blank>www.geocities.com/iroc_dis/iroc_dis_page.html

1971</A> plymouth Duster
Mods:340,edelbrock victor jr. intake, 650 4 barrel holley, heddman headers,40 series dual flowmasters, cold air intake,4:10 gears, just got a new paint job and cragar rims with 315 tires in the back.
:Yeah its not a chevy but damn how many 71' dusters have u seen in the streets.

Well there's your problem.. you have ford parts in your GM... tisk tisk.. :P

Seriously though... Is it a MAF or SD system? Almost sounds like the air metering system is not working properly. Is the SES light on? Has it come on at all? Thats all I can think of at the moment.

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1988 Pontiac Trans Am GTA L98 5.7L, Black on Black with 114,000kms.

Best ET 14.559 @ 95.25MPH
Custom 3" Stainless Exhaust Y-Pipe back (High flow Cat and Flowmaster Mufler)

haha. Sorry to laugh but the header thing was pretty much most of august for me.

That header wrap is freaking useless. And
the starter shield (blanket) is not any better. Know what I did? Bought the highest CCA battery I could find that would bolt into the stock pod, and it works perfectly.. I also have a fan switch to keep my motor cool.

The ford injectors _are_ rated at a different
PSI btw.

Your running almost the same intake setup as me, even bigger with the airfoil and 52MM. I bet your leaning out a bit, infact, I bet your air speed is so *** damn slow that you have absolutely NOTHING under 3500RPM. What are you running for a cam?

Then again, if you bolt on that 12psi supercharger, I bet all your problems will go away. (understand that you'll wanna boost your FP wicked).

You checked for vacume leaks around the SLP
runners? Mine leaked the first time, I think because I had them on backwards, but either way, they leaked a lot.

You know whats kinda silly about the SLP runners? The rough surface for all the crap to gum up on..

Just thought of something.. You didn't disconnect your charcoal canister did you?

Good luck.

-- Joe

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1989 Formula 350 4-bolt mains, Forged .030 TRW pistons, SLP 51010 Roller Cam, Comp-cams roller lifters,
Summit 1.5 roller rockers, World Products Sportsman II 2.02/1.60 heads, Edelbrock TPI Intake,
Cloyes Double Roller timing chain, Mellings oil pump: 13.5 @ 100.23 MPH

Since close of track : Ported SLP runners, Ported Plenum, AFPR, Autometer 100lbs F/P gauge, A/F ratio gauge, MSD 6AL, MSD Redline selector.

http://www.joesperformance.com

[This message has been edited by anesthes (edited December 03, 2001).]

Well for the time being i dont have the airfoil,52mm throttle bodie and SLP runners, i sold them to a friend of mine, and now im using stock, the cam im using is Lingenfelters/accel cam part #74211, the car has alot of power in low and top end, Im not pretty sure about the charcoal canister being disconnected, cause im not running emmissions on the car. the motor is an 87' 305 TPI, so are the parts, i bought the MAF and ESC used, is there anyway to test, if the MAF is broken???? The injectors were working beatifully since i started the motor, this HESITATION thing is getting worse, sometimes it goes away then after 3 minutes of driving it comes back!!!! Im sure this has happen to someone, Should i take it to a regular mechanic or to a GM dealer????? Gotta fix it before saturday

Hi,

This might sound silly but, try running the car with the gas cap off and tell me if you notice a considerable difference in performance.

-- Joe

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1989 Formula 350 4-bolt mains, Forged .030 TRW pistons, SLP 51010 Roller Cam, Comp-cams roller lifters,
Summit 1.5 roller rockers, World Products Sportsman II 2.02/1.60 heads, Edelbrock TPI Intake,
Cloyes Double Roller timing chain, Mellings oil pump: 13.5 @ 100.23 MPH

Since close of track : Ported SLP runners, Ported Plenum, AFPR, Autometer 100lbs F/P gauge, A/F ratio gauge, MSD 6AL, MSD Redline selector.

http://www.joesperformance.com

I've found the problem, there was this miscellaneous house by the distrubutor out back and as i saw it and put my thumb on it there was this type of vaccum so i put a bolt on it for the mean time, couldnt find any other place to put it, after i have done that, the hestitation went away the idle is very good, so weird that a little hose like that can cause so many problems.