hey people i have a question, the other night i went for a spin and on a few occasions when i took the car up over 5-6000 rpm and changed gears i heard a little backfire, not a big bang but kind of a muffled thud, i noticed it didnt happen when i changed gears fast but when i took 1-2 seconds for the change. this was very disturbing, please help! what could it be
regards
john