Ok, this is gunna be long one. I have a 2001 Sunfire 2.2 and im having some problems with it. This has been ongoing for about 6 months, if the car is warm and has been driven already that day, when you restart it and throw it right into gear and go, it will start shuttering and the throttle pedal doesnt affect this condition at all, usually it will end up dying, and always restarts right away. The only code it has thrown so far was a high voltage to the front o2 sensor, which I replaced about 3 months ago, and the code has shown up once since then. If you start the car and let it idle it wont die, but every five minutes or so the idle gets very rough and the whole car shakes for about 15 seconds then smooths right out. Since it started doing this, i have replaced the plugs and wires, cleaned the throttle body, and replaced the fuel filter. Im hoping someone has been through this and solved it. Thanks for the help.

Maybe run some techron fuel clean through it at the next fill-up? Make sure all the fluids are topped off?