I know, I know there are a thousand posts out there with this topic but one thing is similiar in all them; there's no fix action.

I'm getting misfires in all cylinders. I've replaced and regapped the spark plugs multiple times; no change. Right now I'm running plain old copper plugs gapped at .030.

I don't think it's the coils, not on all cylinders. Same deal with injectors. So, what the heck could it be? I did a pressure test and I do have a leak. I just bought a new inlet because I'm pretty sure that's where my problem is. Could that be the cause of the misfires?

I'm also getting a whistling noise at a steady 25mph. It's pretty loud. I can hear it with my windows up and it's really obvious with the windows down. I even had a guy mention it to me who wasnt in the car. I've heard this could be a turbo problem.

I"m also running a Perrin pulley and lightweight flywheel (another speculative reason for misfire).

What do you guys think? I'm pretty tired of chasing this thing I'll tell you that. The car runs good although I can feel the miss every once in awhile, usually during decelleration.