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Ok, I'm going to post this to several forums to see if anyone has any suggestions to fix my problem here it goes.
I have a 1994 3.4l camaro with 150k on it never had any major problems has always run great till lately I have intermeittent problems with starting and with the engine running rough. Sometimes I will try to start her and she starts fine other times I will try and she will turn but not start. I can hear the fuel pump fine. Sometimes when I have a problem with starting her I need to lay on the gas other times I can just wait a few seconds and after a few attempts she will start and run properly. So far she has always started. However a few times after having this problem starting her she will run but very rough kinda like she might be misfiring or something but I can't actually hear that going on all I feel is how ****ty the engine is running if I try to drive her like this she is very slow to accelertate but will eventually get up to speed but it feels like if I let my foot off the gas she will stall at anytime. So she intermittently has trouble starting and has a few times had a problem starting and then run like ****. So far I have replaced the plugs and wires but nothing else. I tried to pull and DTC's from the computer but I get nothing. when I test for DTC's nothing happens the check engine light and brake lights stay on they never blink at all or go out. I was thinking it may be the computer but I'd hate to spend all that money and not be sure. Any ideas?
 

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:yes: I'm not very familiar with the 3.4 in your Camaro, but, I did have a 94 and 95 S-10 and Sonoma with a similar running problem. Both trucks had the same v-6 and problem.... the egr valve on the intake manifold. Carbon builds up in and around the valve (both trucks had over 100k on them)and causes it to malfunction, either opening too much or not enough. It was easy to change out. I don't know if your Camaro has an egr or not, but, it may be worth checking. Good luck!!
 

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thats a good point...carbon balls can hold the pintle open creating a vacuum leak...i believe the egr valve in your case as well as maro`s is electronic....CLEAN IT before replacing, as they are expensive...also i would first try changing the fuel filter...you wouldnt believe how many drivability problems can be related to fuel filters on injected cars...
 

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on those cars got a garbage fuel injection alot of times the pressure regulator goes bad and dumps fuel into throttle body.check when first starting if black smoke comes out and than clears out or pressure guage on fuel line so if nothing or alot of pressure when first starting.
 

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I am going to test pressure this weekend for the part does not sell just the regulator. You have to buy the whole rail and its about 300.00 for part....lol Will post what happened when I do it.
 

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Hmm, this 94 3.4L V6 is the third in two weeks not running correctly, justbrad, Ruth, & now boz2841.

All of them are having the same problem, no start to running rough. OBD 1.5. GM only had it for two years, maybe.

Wonder what's common, besides the operating system?
 
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