vs
Spark plug Autolite or BRISK
Seems like you did everything except swap out a $2 spark plug. I had a misfire on cylinder #1 first then cylinders #3 and #4 until I went out and bought 4 new Autolite 3923 spark plugs and put them in and BINGO no more problems the car is running strong and not throwing any codes.
Pros: car running strong, no codes
Vehicle:
Volkswagen
Part number: 3923
We both run Autolite Platinum and they fired up no matter how cold it is on the first try.
Pros: fires up easily, good in cold
Vehicle:
Volkswagen Corrado
I tried the 3923's and my car ran like arse - rough idle etc.
Cons: rough idle
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