missfires at idle, and under heavy acceleration, also just recently will take longer then usual to start after car is warm (will start perfectly fine at cold start) . Missfire is not consistent and begin after changing spark plugs and installing jb4 tuner. I took it to the mechanic and they cleaned the fuel system, then the missfire continued and they concluded that the spark plug gaps were off, so i bought the recommended spark plugs again (pre-gapped), and changed them all out. The missfire is inconsistent and lightly makes car stutter during idle.Problem still remains
Step 1, Read codes.
a. you didn't seat your coils correctly back on
b. you need new ignition coils, and the 'tune' brought out the problem. coils are notoriously common on that car. New brand name coils for proper result.
if you have 30bb code or similar, you need a dme.
-Abel
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