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Lots of valid ideas here...I'll add one more. A failed or failing cat can cause strange codes. I had failure of a cat on a Mercedes wagon that threw both rich and lean codes along with a misfire code on the left bank. I diagnosed it with an instant read laser thermometer. The rear cat on the left bank was cold due to the forward one being clogged. Replaced all the cats at once and cleared the codes and all has been great for the last 100k miles.
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1986 3.2 Carrera
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