I can help you with the fuel gauge problem. Need to replace fuel sending unit. This is a resistor type. As the fuel level changes the resistance changes and sends the signal to the gauge.
Welcome Pontiac familyProblms and Problems, fuel level I think is not worthy of fixing, go with 300 km or 200M. then refill.Broken or ***** ABC wires.
SOURCE: check gauges light
Possible bad guage, bad wiring, or bad sending unit. Check each one independently of each other, start with wiring first, then sending unit.
SOURCE: 1999 Pontiac Grand Am Fuel Problems
The gas guage has a sending unit in the tank attached to the pump, there is a small circuit board on it that has smal"fingers" that send the signal to the guage.These get worn off and thus sends a false reading to the gas guage in the dash. The gas tank must be removed and a new unit put in to solve the problem. I had to do this repair to mine. As for the gas issue, just try pulling the nozzle back out of the filler neck when putting gas in, sometimes the overflow tube gets plugged up and won't allow the air to escape as the gas goes in the tank, making the gas pump think the car is full, pulling the nozzle will allow the air to escape. Hope this helps.
SOURCE: 2002 Pontiag Grand Prix GT 3.8 Runing rough and stalling at stops
sound like vacuum leak or fuel pump problems.scan it to see if egr valve sticking open.
SOURCE: abs and traction control light faults after a brake job. 2005 Pontiac grand prix
a quick test is to disconnect the sensor connector hook up and ohm meter to the sensor connector on the hub side not the engine side and spin the hub if the resistance rises and falls you're most likely ok if the resistance reads 0 or infinite you have found the bad sensor..this won't always be the case but it's a good start in the right direction
SOURCE: 2005 Pontiac Grand Prix Traction Control Problem
Also not coming to a complete stop before changing gears will cause that as well.
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