Problem solved: upon further research, a bad crankcase ventilation valve can cause: rough idle, intermittent check engine lights, and high pitched screeching sounds...all which I had.
$70 part, 2 bolts, and a pain in the tail to get to the two bolts out/back in, but the CEL is off permanently the idle is smooth.
At first my car died a few times and I thought I made it worse by replacing the hose and valve...then I realized I was an idiot and forgot to plug back in the MAF which I had removed earlier for something else.
It sure feels good to have a smooth ride now! __________________ 1995 318ti Active
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