I just got my IROC back from the shippers & she runs rough. It will idle no problem but when you put her into gear & give her some gas she hesitates even when running steady you can feel the lagging. I'm going to check the timing ? Could it be any of the vacuum lines as well it's a 305// 4 barrel. I put an K&N Air filter package on a few months ago ?
Thx in advance.