I have been making lots of posts on this subject of late and I am getting closer to identfying the problem.
Around the beginning of December my car began chugging and jumping through the RPM range. It also idled poor and lacked power. We thought maybe ignition. Well, I pulled the heads the other day (while doing my cam swap) and had a cracked plug and one of my ignition wires had some small cracks in them in various places. Could that have been it? We also checked the TPS, that was adjusted and the car was still chugging. Also, in doing the cam swap I noticed that the timing chain had a good 1/2" of play on both sides, could that have been it? Also, my cam had some small indentins on the lobes in the wear patterns, could it have been that? We thought it might be a blown head gasket, but both head gaskets were fine. My O2 sensor tip is totally black, so I am getting a new one, could it be that? Also could it be a clogged cat coverter? Or anything else?

So, is it:
clogged cat, o2 sensor, broken plug, wires, timing chain?? or somthign else?

Thanks!



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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End

Current Mods: LT4 Hot Cam, Comp Cams 1.52:1 Roller Rocker Arms, Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET (w/o LT4 cam): 14.32 @ 97.7mph
(corrected for elevation)

7.5" 10 Bolt with 3.42s soon to come!

 

LoL, well man, that is a lot of stuff. Best thing you could do is work your way up to the expensive parts. Like, first changing your O2 sensor, run the car and see what happens. Didn't work? Ok, on to the next cheapest part to replace and so forth. Cause by the sound of all that stuff, they need to be replaced anyways. So your really not wasting any money by doing this and you might solve the problem at the same time.

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Eric Natzke
91 Firebird 305 TBI
"It Ain't Stock"
http://members.aol.com/j007golden/91firebird.html
For info on certain parts or mods go to the site below
http://members.aol.com/j007golden/modeval.html

 

CHECK THE EGR VALVE

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DARREL

 

change your plugs and wires.hehe

and make shure you didnt bend a valve.

 

btt

 

Was the cracked plug and cracked wire on the same cylinder?
The cracked wire could conceivably allow none of the spark to reach the cylinder, and depending on how damaged the plug was, you could have had the same situation on two cylinders, so you may have been running on only 6 or 7 cylinders. This was probably a main reason for your chugging.

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"Arguments are like fire-arms which a man may keep at home but should not carry about with him."

-Samuel Butler