I have a 2000 grand prix gt with the 3800 motor, the car has been layed up for 2 years. checked all the fluids and my find was very dirty(rusty water it looked like)in the rad, started the car up and purred like a kitten, the temp setting was just starting to come up to warm so i jumped in the car and went for a drive in a big parking lot across the street, car stilled worked fine, after a short drive to the gas station to put some new fuel in it because it was really low(had some sort of gas treatment in the tank)fired the car back up and left the gas station and car started loosing its power(about 300 ft away from the gas station), temp light came on as well. drove it straight home. car was idling very ruff. shut the car off. waited for about 2 to 3 minutes car started up fine and idled very ruff again. next day car starts fine runs for a little bit then idles and runs ruff, also if your driving it if you floor the gas pedal the revs go way down, and if you let the pedal come half way up, the revs will pick up(not very fast but it works) there is no engine light on, the only light that comes on is the temp light when it goes up to almost 1/4.
I would start with a gas filter I'd say its restricted.The gas treatment probably caused the filter to clog and gel.
I would have to say the fuel/water separator filter is clogged up. The filter will remove water and crud from the gas. It looks more like a small can under the car. If the car set up with a low tank of gas, water will condensate inside and once the new fuel sloshes around it gets all this junk off the walls of the tank and that gets sucked in the filter. Try and replace that first..
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