Thread: Running Rough after VC Gasket

Changed my leaking valve cover gasket on the '99 GTP. Went to start it just a bit ago and it'll barely idle. I killed it after about 10 seconds and double checked everything. I have no clue what the deal is, vacuum lines appear to be in the correct spots, plug wires, etc.

Did you unplug your injector wires when doing the rear vc?

Originally Posted by 02NavyBlue

Did you unplug your injector wires when doing the rear vc?

Yes, I did.

spray some carb cleaner at the vac lines, if the idle jumps up you found the leaking vac line area.

Alright I was referring to make sure they were plugged back in lol. Check the vacuum lines, sometimes working around them will make any dry rotting turn into cracks that leak. Doing what scotty said will work if it will stay running, it may just kill it since you said it will barely idle.

Could this be causing it? This is the one at the throttle body.

oh the busted evap line. i broke that one too.

i got a fat line, then jammed a smaller one inside it, then the plastic tube into the smaller vac line.

like this.

If you took the coil pack bracket off it could be the ICM ground wire.

Plugs are soaking wet. Had it running for a bit longer.

Did you unplug any sensors? Like Map or Maf?

Icm, wet plugs = no spark. Check coils, icm and icm harness.

Long story.. But the previous owner had a coil pack replaced by a dealership a couple years back. All the plug wires were mixed up , but it ended up being off just right and running fine. I had the plugs off on the coil side and put then back in correct order via the manual, without thinking that the spark plug side was screwed up.


I appreciate the help everyone, thanks!