The first thing I would check, before all that, are the plugs, especially the 2 most rearward plugs. I was having problems with oil being sucked down through the PVC into the intake, and fouling the two rearward plugs causing the same problems you are having. So check the plugs, even if you just put new ones in.
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-1993 Mustang, 900rwhp 03-04 cobra based 4v swap, full Griggs setup, project underway
-1994 Ranger w/ 427cid windsor (daily beater)
check it out!
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