Could be anything, from your fuel filter to your transmission/clutch to your O2 sensor to water in the gas tank to the fact that it's a Pontiac.

Scangauge is your friend. Find out what the Idiot Light is really telling you. Do you have AutoZone out there? They'll come outside and read the code for free, I think...

;) Someone put sugar in your gas.
To check, siphon some out and pour it on a lit match.
You’ll know there’s sugar in it when it caramelizes on the match. /Hog Farmer

Fixed.

I don't know if you have Advance Auto in KC, but many of them will hook up their OBD-II reader for free. It will have a alphanumeric code and a short description. Google the code and that will tell you what the light is on for. Could be O2 sensor, Crankshaft position indicator, etc. Loss of vacuum could cause similar symptoms.

I have a '01 Grand Prix. 110,000 miles. Runs great.

There is a a shop that I normally use that will do free scans on it...going to take it there tomorrow and see what the verdict is.

Blind squirrel/nut

Asking for auto mechanic advice on the CP is nearly as futile as asking for relationship advice on the CP.

Blind leading the blind.

I'd check the influx modulator, and make sure it is properly inflated. That could be causing the vibration. And while you're at it, change all your filters, including the transmission and fuel filter, replace your wiper blades and have your AC charged.

Oh wait...thought I worked at Jiffy Lube there for a minute..... my bad.

everythings ball bearings these days

LOL, yeah...valvoline is the same way. Years and years of my dad changing the oil at the shop he works from or at my grandpa's shop and not once did I see him do anything more than using the air compresser to blow out the air filter and replace the oil filter...but go to valvoline and they want to flush the entire AC, put stuff in my tank, spray some junk where the air that apparently ently being filtered well enough goes into the engine because that stuff in there can big time hurt my mileage....ohhh and hey, your wipers look worn out, I can replace those for you too.

:thumb:




ROFL

My Altima did something similar. The service light came on, it did a lot of what you're saying your does. It was a defective computer chip that controlled the fuel somehow (I know almost nothing about cars, by the way). It turned out there was a recall on that part.

I had loss of get up and go on mine and it turned out to be a restricted catalytic converter.

LOL . That's good.

But seriously. Something like that coould get a person hurt.

It sounds as though you have a problem with the transmission slipping. Try taking a pipewrench and put it on your driveshaft. Try to hold it while somebody puts the car in drive. Have them try to pull forward quickly. If you are able to hold onto the pipewrench without the driveshaft spinning around then you definitely have a slipping tranny.

And I forgot to mention you should always wear safety goggles .