I have a 2000 alero 2.4 engine, the problem that I'm having is that my
service engine light comes on, when I had it check it would say that a
spark plug is miss firing, it woould be change and the light goes off
about 30 days later it will pop on again, but it will say another spark
plug is miss firing, this is becoming very costly and no one seen to know
what is trigging this to happen, the coil and boots that hold the spark
plugs was change in July.I had my wire check and they are fine, I just
would like to know what can be causing this to happen,I know it is
something minor but I just want to be able to catch it before it do some
damage, also my car has a little shaking in it when I start it up and when
I stop on break at the red light, do you know what will cause this also. I
have new brakes and rotor they were done in July.Any help will be greatly
appreciated  
                              Thankyou