Wiring harness is not out of the picture entirely as yet, I have repaired it as there were only a few that were affected that I could find.

My latest research tells me the cis and tps are not getting a signal, more research needed there.

ATTENTION ZEE!!! you might have the same problem. Temporary fix to get idling under control, I have put a plug in the tube from intake near throttle body to air idle valve (cis) and reconnected it, do it so you can easily remove it when we find the solution to this. All looks normal, you can raise or lower speed by idle screw.

Now the car starts and idles nicely around 800 rpm and has no performance problems.

The cis and tps are only in the picture when you come back to idle anyway, I think, but could be wrong.

If you find anything to the contrary please let me know.

I'll post it if I find the proper fix.

Ian. 89 745T. 89 740T. 82 244. 83 240.

PS: Paul your rich mix was probably wiring to your mass air meter affected, only a hunch.