Hi,
My car was misfiring at high revs the other week so I took out the coils sealed them up and put in new NKG Copper spark plugs. (This happened after I put the boost controller on, which is now off). This fixed my misfire problem when driving but made my car idle really bad. I reset my ECU but it didnt make it any better. My car runs fine all the time when driving and never misfires, but when i am at idle the car is missing really bad! Does anyone know what this could be?
Thanks
Matt