Lately sometimes when i go start my car, it almost acts like it's running on 5 cylinders for a few minutes, then all of a sudden it runs fine. I was thinking maybe i had a loose plug wire, but I checked all them. Only other options is something else in the ignition, or maybe my cat is bad but for some reason lets enough pressure through once it warms up a lil bit. After it starts running right, it runs perfect.

 

next time it does that, turn it off and back on. easier in a stick when you can just keep rollin but.

Mine will do that now and then, starts up fine but soon as I get going it was under powered. push inthe clutch, tunr it off, tunr it back on, pop the clutch and she fires up and runs like normal.


Gotta be a sensor or the computer, like a part of it dont start right, shut it off and it resets it. ??? who knows, I would dig more if it didnt run so good.

 

Done the whole restart thing. Still does it. I can tell as soon as I start it up if it's doing it or not. It's not a problem that just happens when I start going. Most times, it'll quit as soon as I start going actually.

 

could be plugs??? long shot though.


long time ago I had an 79 camaro 305 2bb.

when ideling or in the drive through. it would do that, get going and and it was fine. did that for a month and then finally would not even start.

changed everything in electrical system, bought some 89 cent champion plugs as a last ditch effort and it ran. wasnt even close to time for a change, plugs looked clean and great but somehow they were bad.

----- only reason I bring it up cause my 86 did that.
started acting nuts like a bad fuel pump, I changed and checkked everything unde rthe sun, plugs n wire fixed everything.

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Seams
like these Gm cars can eat plugs but show no sign of wear.

 

I was thinking maybe plugs too....I *THINK* they have about 25K or so on them.

 

Injectors tend to stick when cold rather than hot.

You can do an injector balance test with an injector tester(not that expensive and it's a good tool) and a fuel pressure gauge.....unfortunately you have to pull the upper plenum though.

 

My 88 FB did the exact same thing for awhile and last week with some help and suggestions from the board I ended up replacing the coil,plugs,checking injectors,vaccuum etc and guess what the plug wires were on good looked good etc but were bad, it would run fine fore a sec then miss real bad, run fine, bad back and forth and all it needed was a new set of plug wires, now she purrs like she was new, although I probably wasted about 100$ extra in gas while she was running like that, LOL, Oh and the stock OEM set only cost me 20$ or 25$ for a pair of Bosch,s in different colors.

 

Sounds like an injector problem to me. Anyway I would start the car and start pulling spark plug wires until I found the bad hole. Its much easyer to work on it when you know which cylinder isnt lighting.