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1993 945T rough idle 900 1993

If I am not mistaken, 1-1-1 indicates no fault, which just means it isn't bad enough to show up on the OBD yet. I had similar problems and it ended up being a hole in one of the vacuum hoses. Definately check them all in addition to what skim35 had to suggest. From my experience, if it's sucking too much air, it'll do what you are describing.

Sam






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