ryan_89_mustang

When I rev my car it sounds fine revving up but when the engine is going back to idle the exhaust sounds strange. Its like a tuh...tuh...tuh noise but sparatic, also there is an occasional miss at idle I cannot sort out I have new autolite 25's and accel 8mm wire with the boots slathered in dielectric grease.
Heres a quick clip bad I know. You can sort of hear it