ok guys i need help here, i'm at a dead end. 04 Cavalier eco. 3,700 miles on car/engine. Car ran great up till 3,6xxmiles. under acceleration, idle, decelleration-bacially randomly the car "boggs" or hesitates rpm guage goes up/down. It also put the code = Random/multi cyl misfire. i changed the plugs. i also even swaped in a different coilpack that i had laying around and the car wouldn't even start. So any suggestions would be great. thanks guys!

it sounds like a electrical problem. so first things first dose it crank over?

yes it cranks, it will run and drive. i pulled the injectors yesterday and they were flawless. I am switching the coil pack out see if that's the issue

The car is an 04 and only has 3700 miles?

2.2 97 Cavalier......the "Crapalier"

haha yup sat for a year or so while i was fixing it. bought it is 272miles