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500 efi erratic idle

Old 06-07-2011, 09:43 PM
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Question 500 efi erratic idle

The motor fluctuates from about 700-800 rpm for about 20 seconds then drops down to 500rpm for a second. It is also slow to come back to idle if you rev it.

What could it be? Iac motor?

Thanks in advance!
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Old 06-08-2011, 12:38 AM
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IAC or a vacume leak,
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Old 06-08-2011, 12:46 AM
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IAC would be my guess.
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Old 06-08-2011, 05:49 PM
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Originally Posted by soonenough
The motor fluctuates from about 700-800 rpm for about 20 seconds then drops down to 500rpm for a second. It is also slow to come back to idle if you rev it.

What could it be? Iac motor?

Thanks in advance!

You had the intakes off right ?
Are all 3 vac lines connected back up at the rear of the
intake?.. pcv hose too ?, or check the plenum o rings to make shure they're still in the proper position/groove in the lower intake runners.
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