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92 ls surging at idle as well as driving no codes what is cause?

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Old 08-03-10, 08:07 AM
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91ls400own
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Angry 92 ls surging at idle as well as driving no codes what is cause?

My 92 started surging few days ago and got worse. now at idle goes from 800 rpm to 0 back to 800 slowly bacck to zero and dies. when driving at 60 and engaged cruise control, will drop from 60 to 55 and then back to 60 continuously.
Changed MAS as well as ECU with no results. I have no engine codes.
Any help would be apreciated closest Lexus dealer 150 miles away and local Toyota will not touch it.
Old 08-03-10, 08:40 PM
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avalon42
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Idle air control valve...did you clean your intake by chance?
Old 08-03-10, 09:14 PM
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dbaze25
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maybe the egr valve? idk much about ufc10 but that could be it.
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