Re: 156 erratic revs & stalling when hot.
lol that second temp sensor had me searching all over the place too. It turns out the temp sensor is dual purpose, it has different functions for the gage and the ecu.
I tested mine with a multimeter to see what resistance it was reading, but I couldn't get a reading for it, so I bought a 2k resistor and put it in place of the sensor, hey presto, injection light went straight out. So I've bought a new sensor and all lights are now out and the cars running like a rocket, comparatively any way.
Only problem I'm still having is an erratic idle, not as bad but the car seems to be hunting for idle rpm and occasionally stalling.
Every thing else is working great now, cars running upto 90 fans cutting in and it's dropping down to 70.
Starts straight away even when hot.
Thanks for the advice guys, been a big help.