Brush your offending connectors clean, then grease, reinstall- see if that helps. If not, you might want to replace that harness. Another thing, IIRC, the 02 has a metal intake manifold, at least I think so. If not, disregard this. If you do have a metal intake manifold, run a wire from a bracket screw- maybe fuel rail hold down screw- and then take it over to the car's chassis.
Replace PCV line and the PCV. Yes, you can get it off. Try twisting on it instead of just pulling. Ford makes an improved insulated line for $20. It's worth it. Most of the problems with that vacuum line are due to heat.
If this doesn't work, then swap out your platinum or iridium plugs for standard plugs. No, that won't cure your problem, however within a few thousand miles you'll have another clue to your problem- spark plug deposits. You can't get those with plat or iridium plugs. At least not in a short time. That might help you diagnose your issue, for example, your intake manifold vacuum looked good, but you could still have a small leak like an injector washer or the manifold might be loose at the end of the manifold.
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