1999 pontiac grand prix gtp running hard

Question edited for clarity.
Question moved to model category.

Sorry for your loss Patty.

Never press gas and brake at the same time, the car is computer driven and knows that can't be right, it brakes, or it accelerates, but never both.

Drive to AutoZone and ask them to scan for the engine code that makes the Engine Malfunction Light come on. They will tell you what the code is. Write it down and report back. It will be Capital 'P' and 4 numbers. Let's fix that before we get into the rough running, because the code might be the one that is causing it.

Just walk in and say "the engine malfunction light is on my my vehicle, can you tell me the OBD code associated with it please". They will know that you know what you are talking about. Then tell them you will go home and research it and will be back.

Click Comment under here when you have the answer.

This link may help you. Coolant Elbows Leaking 3800 Pontiac GM Chevy 3 8 Liter V6 engine water...

No idea without my head under the bonnet sorry

did you check the lower intake manifold gaskets? they go bad on the 3800 series 2, since you have the supercharger you won't have an issue with the upper intake because it is not plastic but the gaskets may be bad as well. that engine runs best with irridium plugs.

check tps sensor check idle air control valve or iacv for proper func

usally means engine is running very lean replaced fuel filter yet

that would be your o2 sensor most likely. make sure its plugged in properly and that its not bad.

bad fuel pump.- just replace it and your good to go!

check fuel pump resister. its conector is by the batt. pump runs through it in run, not for 3 sec. when key is turned on. thats why it will start and then quit this happend to my 99 gtp

i have had two of these problems both on grand prix's , both turned out to be a mass air flow meter. but nethier set a code for the sensor.