Idle problems with 99 Grand Prix gtp 3.8L


Asked by Sep 27, 2016 at 05:05 PM about the 1999 Pontiac Grand Prix 4 Dr GTP Supercharged Sedan

Question type: Maintenance & Repair

I replaced the fuel filter, the air mass
sensor and recently replaced the fuel
pump. As of yesterday 9-26-16 my car
started acting up, I turn the car on and it
only idles for no more then 5 seconds. The
battery dies after a few attempts, the
check engine light doesn't come on. Last
Tuesday I took it to GM dealership and
since then my car has been acting like the
light go dim and bright. What can be the

5 Answers


Bad battery or Alternator. Charge the battery so you can drive it to ur local auto parts and have them check ur charging system, its a free service

Best Answer Mark helpful

The car won't stay idled enough to be put in gear. I unhooked the battery right now it does start but won't stay idling.

1 of 1 people found this helpful.

I researched online and found a video of someone with the same issue as me and he said he reset the MAP on the car and it started right up. How and where can I do that? Will that work?


Map sensor is connected to the hose between air filter and throtle body. Disconnect it and see if it runs for a bit, if it does, u'll need to replace it, they don't reset

On a new model Grand Prix how does it act if the Cadillac converting is going bad

Your Answer

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