Question about 1999 Pontiac Grand Prix

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I have a 1999 grand prix and every time i stop at a light the car seems like it boggs down and i thought it was the bad gas but i had put dry gas in it but the problem remains the same

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Hello! Your problem could actually be a few things - but the most common are:

1) Dirty MAF sensor - if you run an aftermarket air intake (especially with an oiled filter) you increase the liklihood of a dirty MAF sensor. You can clean the MAF with electronics parts cleaner - but be extremely careful when doing so and do not wipe, push/pull on the internals of the sensor.
2) Clogged fuel filter. The fuel filter is located on the driver's side, mounted next to the frame, approximately 18" in front of the rear tire.
3) Clogged catalytic converter - This is a very common cause for power loss. If clogged, you're car can't "breathe", and car engines are essentially - air pumps. Tell tale signs will be strong aroma like that of rotten eggs.
4) Not sure if you have a SE/GT or GTP - but if you have a GTP - you may also have a vacuum leak - either near the brake booster or under the supercharger snout. Under the snout, there is a "T" fitting that is very much prone to cracking/breaking.

Hope this helps and good luck!

Posted on Sep 25, 2009


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