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Old 04-15-2011, 01:05 PM   #1
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the rpm shuffle?

88 5.0 and it does the oddest thing sometimes when in drive at idle with my foot on the brake the rpms will shoot up to 1200 or so then drop down to like 700 then back up and down etc etc. And when the rpms go up you can feel the car come under load then release when it drops......I was thinking tps but it only does it once Ina while. Any ideas?
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Old 04-15-2011, 06:30 PM   #2
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Tps going bad or idle air control sensor im no mechanic but my 95 5.0 was doing something like that it was my iac worth checking out easy fix part about 100 buck
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Old 04-16-2011, 01:32 AM   #3
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With your foot on the brake it may be a vacuum leak at the brake booster. I would check vacuum hoses first before replacing expensive parts. Does it do the same thing at idle without moving? If I am not mistaken there is a surging idle checklist on try this link.
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Old 04-16-2011, 10:57 AM   #4
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Re: the rpm shuffle?

It does sound like maybe a vacum leak somewhere.
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