I've searched and come up empty.

Untill this morning my 87 base was running strong. However, she decided not to rev past 3000 RPM under load. With the clutch dis-engaged she rev's freely.

What could be wrong?

Background info:
After two months of sitting (I started a brake swap, had to travel for work, and every time I came home for a few days I found a part I needed before I could continue, and then had to travel again). Any way, after replacing the fuel pump, filter, plugs, wires and leading coil, it turned out to be rotten gas. She ran well until this morning. In addition, the ignition switch started to be flakey monday night, and I've had to stall the engine and disconnect the negative battery cable several times. Damn parts houses don't have a switch in stock and the Rex is my only running car.

Timing?
Computer?