Cylinder # 3 is misfiring under load .
SOURCE: 2005 pontac grand prix emission problem
EGR Valve needs replaced, because my gas cap light has been on forever even after replacing it and found out later it is more than likely the EGR Valve which when it screws up causes misfiring and poor performance down the road if not fixed soon enough and also leaves you with very poor gas mileage. The cost of the part ranges from $150 to $270. On the other hand it could also be Ignition Coil which costs significantly less but less likely for this to be the actual problem. Its cost is about $80 for the part.
SOURCE: 2002 Pontac Grand Prix GTP P0171 code engine stumbling at times
Bank 1 is the frt side exhaust manifold (did they say bank 1 sensor 1?),you can start by replacing that sensor,i would check the intake for leaks ,the gm 6cly. are known for bad intake gaskets,you will see oil coming out form the frt or rear of the intake,also check your atifreeze overflow bottle for bronwish sludge,which means that the oil is mixing with the antifreeze.A leaking intake could cause that lean condition.
SOURCE: 1999 pontiac grand prix gtp won't start
well from what it sounds like is that it is your fuel injectors try going to a full service garage and have them clean the fuel injectors if you cant get it there go to auto zone and pick up a can of sea foam and do it your self thru a vacum line such as the brake booster there is a vacum line that comes out of that and goes straight to your cylinder that will help you there its recomended once a year or every 15000 miles good luck hope it works for you
SOURCE: 2002 grand prix 3.1 code says number 6 cylinder
It's a possibility the injector is the problem. It may not have the psi it needs, therefore the cylinder could be misfiring, or the injector could be letting too much fuel in. Before I change the injector, I would try to have someone to clean the injection system to see how it works. The cleaning around in South Carolina is $99-$149 depending on where you go.
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