08 Pontiac grand prix 3.8L V6 running rough out of the blue
Asked by BenE1977 Jun 26, 2015 at 11:49 AM about the 2008 Pontiac Grand Prix
Question type: Maintenance & Repair
I was driving my car this morning and it
was running perfectly fine. Stopped
somewhere. Then when I got back in my
car and tried to start it. It did not start right
away and is all of a sudden running rough.
Like it's missing. When I'm driving it seems
to be fine. But when I slow down and idle
it's running very rough. Car has a light
shake and sounds sputtery. Any answers?
Answers as fast as I could get them would
be nice as I need my car to get kids and get
to work.....
5 Answers
Sounds like MAP sensor or MAF sensor. if these don't work test the ECM
I just went and had it put on a free diagnostic. They said it had random cylinder misfire. They said it could be spark plugs, plug wires, or coil packs. So I get to check or change those.
PeggySue2u2 answered 8 years ago
How'd it go? My mechanics have been going back and forth on my car. I have one mechanic that has hooked my car up to everything to no avail or probable cause. But when I think it's gonna work; it doesn't. I have another mechanic that will replace my starter module and plugs that may or may not fix the car. I have the car start up most of the time but have to floor it to get it to start sometimes. It also sounds like it's misfiring when I go uphill.
2005 pontiac grand prix gtp supercharge was running perfectly fine. Got done working my car was running really rough where i would the car in neautral sitting still to prevent car from dying. Had my car in neautral at a stop light and i heard a short whinning noise and car shut down and I am unable to get my car started again.
How do I go about changing the plenum
