If you used auto lite spark plugs that is almost certain the problem.
Reviews of Autolite spark plug
434 votes
If it didn't misfire until you put plugs in it I would suspect the plugs are the cause.
I would also like to leave a comment here about having success with an autolite AR52 plug. Same exact thread size and identical reach as the OEM torch plug.
Autolite or Brisk plugs with stock gap.
I have a 05 with Edelbrock SC, 11 pounds of boost, and E85.
autolites are some of the worst spark plugs, grab some NGK iridium’s and it should be fine
Them Autolites are sweet, if they were edible I'd ask for them in my Kung Pow?
I have a 2019 GTI with 65k km. I decided to do plugs and when I saw how expensive OEM were, I said screw that, i'm going to try the iridium auto value basic ones. I thought the difference in quality would be negligible. I ran the Autolite XP5325 plugs without gapping. All seemed fine but then when pulling on to highway under load at 3k + RPM, misfiring like crazy.
I replaced the spark plug with an Auto Lite spark plug. Engine light went away but still runs rough and misfire on acceleration.
it was the Autolite spark plugs. Had car towed to my mechanic. They replaced with spec NGK and the car is running fine.
Ran Autolite Iridum XP XP3922 plugs in it and had zero issues at about half the price of the NGK plugs, and I had a mild tune.
Write your review about spark plug Autolite
Help others - share your experience with this part.