i have a 32 valve northstar v8 .. the issue is a miss only while driving .. seems to have a slight miss at idle but def gets worse while in gear ! no over heating or steam from pipes , no water in oil , got a small antifreeze leak from a bad hose and valve cover leaking ,, may be head gasket but not sure , im thinking fuel injector, or coil pack .. cant get any codes ,changed all 8 plugs, wires all looked good so left them on ..

ANY IDEAS ???

 

I would look at the plugs, wires and coils for this problem. I'd be willing to bet wires are original and coils too, never hurts to change plugs but of course they are $20 each.

You can check wires by using a spray bottle ans when car is running spray water on wires. If you see arcing change them . Any signs or cracking . change them. Check coil terminals for rust and corrosion.

 

changed the plugs !! they wer 6 bux each .. but didnt change the wires .. ther a lil pricey , but wen i get the flow i will change them out !!