Originally posted by LateApex
I've got a Helms manual on the way. As soon as it gets here I'll locate where the engine coolant temp sensor is and test it for resistance and voltage.
ECT sensor is on the head at the nozzle for the upper radiator hose, it's got a 2-wire connector. The 1-wire sensor is for the dashboard temperature gauge. There's a similar 2-wire sensor at the lower radiator hose (t-stat housing), that's the fan switch.
I don't have my '95 manual right here, so I can't look up resistances for you right now. The sensor is a variable resistance, your Helm book will say how many ohms it should have at a few different temperatures.
The way you describe it - bad at part-throttle, good at wide-open throttle... That makes me suspect the throttle-position sensor.