Misfire(s), bad... car

Okay I've narrowed all of my problems down to the EFI system. Problems being; lack of power, stumbling, hesitation, rough idle\high idle, and the misfire. I've ruled out the Ignition system cause I've replaced it down to all but the TFI module on the distributor. I'm thinking how often do the vane air meters go bad? I'm going to replace the ECT sensor, IAC controller, test the TPS system for .9 voltz(correct me if i'm wrong). The FPR was replaced at 110000 miles (currently 130,000). When I test the other sensors am I looking for a 5 volt reference, before I remove them? And I was also curious about the EGR valve diaphram leaking cause I thought I was hearing a exhaust leak.

Another thing I was wondering is ther a MAP sensor on these cars or is it intergrated to the VAM?

just FYI the misfire is only under boost at around 9lbs. If I slowly left it get up to boost its fine until WOT.

any takers?

I retorqued the exhaust manifold just to be sure. The plugs are motocraft plugs gapped to .34. wires are motorcraft. Every thing I've replaced has been the ford replacement. I have not checked the timming belt since I re did it about a year ago. I do how ever hear some sputtering when I slowly get it up to speed, but I can't distungush where its comming from with the road noise. I was just throwing ideas out to possibly identify the problem I havn't bought anything yet execpt for the ignition switch on the steering column cause It won't start unless I jump the starter solinoid. I'm bringing the car into the shop on sat, to pull fo codes.