CEL Engine misfire,seems ok after spark plugs change,but still got a softer problem I have another thread of this issue but not many answers. I have a my12 Ampera with 84k km, I had once last year a CEL starting the car in winter at -15C and I guessed it was a bad fuel, clear the error in...

I recently got a repair quote from the Dealership. My 2 and 4 cylinders are misfiring. Needs new coil pack and the throttle body cleaned with new sparkplugs. My question is: How does one start and stop the engine on demand while it sitting in the garage? Is there a switch you can...