Hey guys ive finally got everything running smoothly with my camaro again but now I'm wondering why when my car is in park or neutral I hear no misfire when revving all the way up to let's just say 5k rpm's. But when I'm I'n drive and I'm actually on the road I hear a slight misfire and it's not as smooth when in park or neutral. I have open headers so I can hear everything and at idle I don't hear a single misfire. When I'm driving it's not like it's a bad misfire or anything it just sounds like to "me" and no one else that there is a slight misfire. I'm pretty sure my vacuum advance is set correctly and all my hoses are brand new. It's not bad I'm just wondering why I'n drive it sounds like that but sounds fine in park!?

My engine specs are in my signature.

Hope you guys can help,
Thanks, Blake.