Question about 1991 Lexus LS 400
You have a vacuum leak that is causing the idle to fluctuate and remain high. Check the rubber intake boots on the intake system for cracks or leaks and also check ALL vacuum hoses for the same. I'm betting a hose has cracked and is causing the IAC motor to try and compensat for the vacuum leak.
It was a bad call for someone to suggest the MAF replacement.
Posted on Sep 15, 2010
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Posted on Jan 02, 2017
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