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I would look for any leaks in the intake air hoses. The engine may have vacuum leakage from a hole in a hose. The most likely one is the short hose on the discharge (left front) side of the intercooler. You need to inspect all the rubber hoses for failure however.
Soem of the hoses are expensive- if you can't afford to replace one right away it can be patched if you clean it with rubbing alcohol and apply tape, but consider it a temporary fix. It will at least prove whether it is the problem.
Good luck with it!
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Rob Bareiss, New London CT ::: '87 244DL/M47- 229K, 88 744GLE- 218K, 82 245T-181K Also responsible for the care and feeding of: 88 745GLE, 231K, 87 244DL, 239K, 88 245DL, 246K
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