1998 Grand Prix ...Last week I got gas when running real low and was in a rush. In my haste I noticed when I was leaving the ground around the tanks was dug around there. a couple days later my car started jumping, choking and missing & the service light was on..I went to auto zone they ran a check.It showed the oxygen sensor and injector was the problems. they had me run a bottle of injector cleaner in my half tank of gas, and use all that gas. I ran the car today until I was down to 60 miles left in the tank.It still is missing, jumps a little less but the service engine light is still on also. Should I run more injector cleaner in another tank and run that before I do anything else?

There are many possible issues here. It could just be that the idle is set too low. Could be weak spark, fuel delivery, charging system, etc... Get it to a mechanic to diagnose it for sure. They should do that for free at least.

Hi Jennifer-
I believe I may be able to help you with the gas spillage you are having when filling the tank. This happened on my 1998 Toyota Camry.
One day, even though I was low on fuel, the attendant had trouble adding gas to my tank. Gas would spill during filling or the nozzle would click off (as though it was full) even though it was not. I had to stand there myself and slowly add gas until the tank was full.
I learned that my car had a thin vent tube that would run from the gas tank to the gas tank opening. As gas is rushing into the tank during filling, the air that is being displaced from the gas tank escapes through this tube. This tube had rusted closed a bit and was restricting the air flow escaping from the tank during pumping causing the problems I described. Once this tube was replaced, my problem was solved!
Hope this helps!

If it acted like it wanted to start, then I would suspect the fuel pump. Try hitting the bottom of the tank, this sometimes jars the pump to start working again. If it works you can drive it, but you will need to replace the pump, it will only do this so many times.

If the engine is running well and not running hot, chances are that the coolant level sensor has failed. You can either replace it or ignore the warning light and just check the level as "routine maintenance"
while checking your oil and other fluids weekly as every good vehicle owner does and has done since there were cars to drive.

Your ignition switch is bogus. High speed runs directly off the speed control but the lower speeds go thru the ignition switch. Do not know why but that is the way it is!!!!!!!!
Replace the ignition switch and you will be back in business.

First of all $900 for a fuel pump? You got ripped! Sorry ,I just replaced one myself and fuel pump only cost me $214 with life time warenty. if you are the least bit mechanically inclined? Get a piece of plywood about 2ft-x2ft and place on floor jack under gas tank ,siphon as much gas as you can out of gas tank,mark the three lines on the passenger side of the gas tank on top(1,2,3)and dis connect,.jack upplywood to gas tank to hold weight while loosening 2 metal bands(straps) around gas tank, there are 2 bolts on each strap, lower tank to ground and slide off jack,jack up rear of vehicle to slide gas tank from under vehicle, remove the "C" clip to release fuel pump from gas tank. reverse this procedure to reinstall new one. The only problem I had was the new O ring gasket that came with new fuel pump was too stiff not allowing enough clearance to install C clip so I used the old O ring gasket and had no problems. That occasional popping could be a cv axle assuming you have all wheel drive.

Yes it's easy to do, remove tank pull pump off of tank, and replace pump, Napa has this pump # 6651533 it runs between $14.00 and $20.00 .

sending unit in tank may be shorting out or the wire to tank is shorting try removing plug connection and applying some electrical cleaner and plug in and remove 4 or 5 times to clean plug contacts they may be dirty worst case replace sending unit in tank.

check the gas cap. there is a sensor somewhere in the gas tank that knows when the gas cap is loose or has a defective seal.

It could be that your fuel injection system is failing, try putting some fuel injection cleaner (gas additive) into your gas tank, you should notice a difference after the first full tank. If not it will be time to get your system checked-out at a garage.