I adjusted my minimum air, reset the tps sensor to .540, then check timeing (6*) and all is fine. I tried to recall back to when it 1st started. There were two things i did. One was finish porting of the plenum and the other was add fuel injector cleaner (XR-1)...Could i have gone wrong along the way somewhere?

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89 IROC-Z 350 TPI

-Flowmaster Catback
-Performance Resource Chip
-Rebuilt 700R4 Tranny
With the goodies to go

-K&N Airfilters
-Ported Plenum
-2.77 Gears (not much to brag about but eh, its there)

 

Branz,

Backfiring, not the serious "WOOF" but constant "popping" is usually a symptom of running too lean. Since you removed the plenum, you should make certain there are no vacuum leaks and all hoses/fittings are properly connected. The TPS and timing settings should be good. You might want to test the fuel pressure to make sure you're at least holding 37 PSIG +/- 3PSI. Since your ported plenum should be flowing a bit better, you might want to be a few PSI higher thatn the stock setting.

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Later,
Vader
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"Make Me Bad"
Adobe Acrobat Reader 4.0

 

Is it thought the intake or out of the exaust the poping?

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86Z28, GM 350, Jet perf Q-jet & chip Dual snorkel air cleaner, Edelbrock performer intake, Edelbrock headers, Edelbrock cat-back, Off road pipe, MSD 6AL, Accel Super Coil, Taylor Spiro-pro wires, Rapid fire plugs, Jet fan switch, World class t-5, Hurst Short Throw Shifter, Ram Flywheel, Center force dual friction clutch,Aluminum drive shaft, BW disc rear 3.45's & a posi, PBR calipers, Earls braided brake lines, Polygrapite bushings all the way around, poly tranny mount & torque arm mount, Hotchkis lower control arms & panhard rod, Rancho limiter straps, KYB struts & shocks, Gm Wonderbar, Edelbrock strut tower brace, SSM sub frame connectors, Jamex lowering springs, Carbon metallic brake pads, Crossed drilled rotors, Mobil 1 Tranny fluid & motor oil, GM syntheic rear end oil, K&N, Grant stering wheel, 1,200 watt system, Jet Black Paint, 91 Z28 rims, 92 wing, Tinted windows.

 

It doesn't happen all the time, just every once in a while when i am driveing. Froma dead stop if i give it gas in good amounts, it'll hesitate and act like it wants to die, and sometimes it'll backfire from what i think is the exhaust.

------------------
89 IROC-Z 350 TPI

-Flowmaster Catback
-Performance Resource Chip
-Rebuilt 700R4 Tranny
With the goodies to go

-K&N Airfilters
-Ported Plenum
-2.77 Gears (not much to brag about but eh, its there)

 

Fuel pressure is fine, everything is fine under the plenum.... Could the porting have caused me to all of sudden go lean? Man, it sucks being 16 and not knowing anything...
The fuel injection cleaner couldn't have done this could it? How much air increase would be neaded to go lean?

------------------
89 IROC-Z 350 TPI

-Flowmaster Catback
-Performance Resource Chip
-Rebuilt 700R4 Tranny
With the goodies to go

-K&N Airfilters
-Ported Plenum
-2.77 Gears (not much to brag about but eh, its there)