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Making some progress I think.
Tested the cold start valve and thermo timer switch today effectively ruling them out.
Finally in an act of pure frustration I began moving the main wiring harness up and down, to put in nicely.
I noticed when it was pushed down the miss became significantly worse, to the point the car would almost die. When pulled up, the miss would almost disappear???
I took a zip tie, pulled the harness up and went out for a drive. Much improved, still misses over 3500rpm. But I think the bimmer gods finally threw me a bone.
Tomorrow is Sat. and I got all day to dissect, separate and find the wire or connection that has been causing me so much grief. Hopefully this is it and not some other problem I induced by trying to strangle her by the wiring harness.
Any thoughts on what wires running through it would or could cause these symptoms?
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