ive got a miss i think in #1 and #2 cylinders most noticeable at idle and cruizeing if i put it to the floor it seems to run fine but thats the only time ive replaced coil ,distributer, wires,plugs,cap,rotor done a compression test resealed the intake checked grounds i dunno what it could be im running an lt1 intake 2nd year for it no probs from it last year holley tb cc305 cam afr 195cc heads any ideas? thanks guys

 

Somthing like that could be a sign of a cam going flat or a faulty lifter. If you eliminated all the electric its most likey in the valve train.

 

ive checked valve train alls good cams brand new roller jus put in last months

 

Sounds like a vacuum leak.

 

i put a new holley tb on and swap my iac houseing to holley tb coule a iac houseing leak cause this?