Hi, in my car(1999 chevy malibu,4 cylinder) check engine light is on, and it is shaking when car is started & drive with lower than 20Mph. when i shown to some of known mechanics they said problem in coil set & i must reply the hole set because in my car the total 4 coil in one set. Can you please help to solve the problem it's great help to me. Thanks in advance regards Vijay 5103632852
If you have a spark tester or insulated pliers you could verify spark at each tower. The wires could also be tested. The easiest thing would to take it to a parts store and see if it is a misfire code. Don't change any parts until it has been verified as to what the cause of the fault.