First off my car ran great before christmas. My plugs got fouled when my alternator went bad and since the i have changed them 2 times just to be sure. It took me a while to finally get it to idle properly but the car was tuned at fastlane and ran great even after i had brought the car home. After the plug change the car began to have a miss/hesitation above 4k rpms in an erratic manner. The weather is now consitantly around 25-30 degrees but im trying to find out what my problem is. The miss is very slight and only felt through the pedals and steering wheel sometimes and barely noticeable on the tach. I have regapped the plugs from .032 to .028 and that seemed to help. The maf is clean and the plugs and coils continue to check out ok. Does this mean i may have too much timing above 4k. What would be the first action i should take?