ps2cho,

I have a 88 300TE, and went the same route. Concentrate on the potentiometer/air flow sensor. My sensor would do the same thing when it got warm, sometimes it would read off the correct reading, and sometimes not. (pins 1 & 2 .65v then intermittently to 1.01v - 1.04v)

This would be my second sensor that i've installed in the car in 2 years. First year the rpm gauge was sporadic(dead giveaway), second year(day before thanks giving 09') started to do what yours did in the video with the economy and rpm's,and later on my rpm's/idle got sporadic car started to die on occasion at stop lights or to turn.

Replaced mine, and set it to .65 and it runs great.