saturn ls1 2000

When you raise it above idle does it smooth out?Also does the cooling fan all the time at idle but shuts off when you raise the rpms up?

yes when i raise it above idle i dont feel it .the fan work when the it heats up

If you let it idle for a while will fan come on and not shut off?If sound's like the timing chain may have jumped.

the fan works fine no problem with that it comes on when car heats up and shuts off when the gague goes down but the car shakes regardless of fan comes on or not in idel u dont feel that much but while in drive u press brake u feel a lot it shows code p0300

So as long as your driving a steady speed you don't feel a miss?

yes i dont

If it's only at idle it's sounding like a cam timing issue the first one i have ever seen like that miss fired really bad at idle and when you raised the rpms the miss fire would smooth out.Come to find out the timing jumped and the intake cam timing had advanced two teeth.If you want we go thru and check compression etc or dive in and take off the valve cover and check the timing.Which i really think it is those early 2.2L engine's are known for timing chain issue's.So which would you like to do?