I now notice that my car runs like a tiger, even more than before after the new wires, plugs, cap & rotor, new tranny oil and filter, engine oil and filter, new fuel filter and transmission crosmember....but for some reason it makes a sort of a popping noise in the morning when its cold and I put the car in gear and get on the gas, sort of like an internal backfire...also when I was hauling A$$ last night it would like missfire or something...thats when I had 87 octane in it, now that I switched back to 93 octane..it doesnt do the misfiring at high RPMs but only that pop in the morning.....what could this be??? AARON