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Try pulling off the flame trap vacuum hose again and just blocking it. Does the idle change? If not, the trouble is not there.
I agree you're looking for a vacuum leak. Sounds like a big one. Did you have the intake manifold off the car for this work? Did you install a new gasket?
How about the hose to the brake booster? That can be a major source of vacuum leaks if it's split or not seated.
Good luck with it!
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Rob Bareiss, New London CT ::: 87 244DL, 88 245DL, 90 745GL, 84 242DL project, 89 244 parts, 88 244DL to replace the 87
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