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I have been dealing with this problem for a long time with my 86 740ti Im pretty sure i know what it is i just dont feel like busting my knuckels right now to get in there and fix it, my wire harness shorted out and i have to replace everything along the lines and that was the only item i did not replace, unfortunally i believe it is called the ETC sensor it should be below from front to back the 3rd injector going straight into the head. Not easy to get to or get loose. Will also cause your gas milage to get all screwy too. So i would deff recomend you check and replace that sensor down there.
Good Luck
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