Originally Posted by swansong
Yeah I really think its a silly electrical issue somewhere.
x2. I would suggest after reading your tthread and all your symptoms, you check the coil and coil connector thoroughly.
I had intermittent good/crappy running conditions such as yours and it turned out to be the coil connector. What I believe was happening was that, once warm, condensation or moisture evaporated or simple minor expansion of wires under heat restored the continuity of the wires enough to make the car run normally (still somewhat intermittent under load); during cool off, it was back to hard starting and poor runninng and the cycle would repeat.
Can you beg or borrow a substitute coil to try also? The intermittent may be inside the coil as well as being related to the connector. I'd aslo unwrap the black plastic coil connector harness sheathing back a good six or eight inches to trace the wiring and make sure all is well.