1992 Honda Prelude Idle Surge

1992 HONDA PRELUDE
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TOEKNEE
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Engine problem
1992 Honda Prelude 4 cyl Front Wheel Drive Automatic 250xxx miles
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Hi, I'm just wondering why my car surges RPMs when I let off the gas. When I drive and then let off the gas to brake my RPMs go up and down about 2 times.
Dec 29, 2007 at 2:46 PM
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MERLIN2021
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You have a vacuum leak, get a can of spray gumout, spray the vac lines and maniflod area, when the idle changes, youve found the leak! Or a stuck EGR valve...
Dec 29, 2007 at 2:47 PM
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TOEKNEE
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Do I spray inside the lines or on the outside? What's gumout supposed to do?
Dec 29, 2007 at 3:31 PM
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MERLIN2021
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You want the engine running and spray on the outside but do direct the stream onto the hoses, if it is a vacuum leak, the engine idle will change speed, then you have detected a leak, repair the vacuum leak and see how it runs!
Dec 29, 2007 at 7:53 PM
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TOEKNEE
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Ok, I'll try that. Thank you!
Dec 30, 2007 at 12:12 AM