I changed the spark plugs on my car, to the bosch "no gap adjustment" needed variety. Since changing them my car has trouble starting. When it does start the engine idles and runs hard, almost shaking the entire car. I have no power, and my gas millage drooped from 22 mpg to 13 mpg highway. I know I did something wrong, I took the plugs out and inspected them, and ended up changing them again to new Bosch spark plugs but the same problem. The car is also backfiring. I dont believe I could have messed up the wires because they seem to match up only in one possible way. Thanks Matt
Feb 19, 2007 at 6:54 PM