You just wrote up most of those things, however there should be an injector resistor (if I'm thinking correctly) on the upper driver side of your engine bay. Small box maybe 1 inch deep 2x3 with fins to dissapate heat. I replaced mine and noticed a marked increase in throttle response.

Mechanically, is you clutch slipping at all? RPM's jump when you try to accelerate? Or a strong neck jerking stutter when you stomp on it at speed?