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Answered 2011-09-13 22:23:54

The racing up and down at idle is call enging loping, usually caused by a vacuum leak. It could also be caused by a sticking choke at the carb. Whatever the case may be, you will need to start by hooking up a smoke machine to find the source of the leak. Also check your coolant level.

my 1991 Toyota 4x4 22re had the same race up and down idle. it was a low coolant level.

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