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Engine revving

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Old Oct 20, 2010 | 04:04 PM
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Default Engine revving

Put a new engine in my C4 and a new transmission a year ago. it was running perfect, now all of a sudden at idle the engine seems like it is hunting. Also not shifting correct now. Not throwing any codes. Anyone ever have this problem before
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Old Oct 20, 2010 | 04:08 PM
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What year? Throttle valve cable or electronic shift?
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Old Oct 20, 2010 | 04:14 PM
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vacuum leak?
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Old Oct 20, 2010 | 04:34 PM
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Dirty IAC and/or plenum?
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Old Oct 20, 2010 | 05:26 PM
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Originally Posted by sailorsteve
vacuum leak?
I suspect same but really need year and conditions,(engine cold/hot etc).....
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Old Oct 20, 2010 | 11:55 PM
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89 with tv cable-cable checks out good,I replaced all the vacume hoses when I installed the new engine. Started it earlier, at idle it revs high to low-when i give it gas it stalls.No computer codes still
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Old Oct 22, 2010 | 04:13 AM
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Originally Posted by C4MAN66
89 with tv cable-cable checks out good,I replaced all the vacume hoses when I installed the new engine. Started it earlier, at idle it revs high to low-when i give it gas it stalls.No computer codes still
try hooking up vacuum guage-how many inches of mercury does it pull? 13 to 16 is good and should be steady with stock cam..
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Old Oct 22, 2010 | 03:51 PM
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Originally Posted by C4MAN66
89 with tv cable-cable checks out good,I replaced all the vacume hoses when I installed the new engine. Started it earlier, at idle it revs high to low-when i give it gas it stalls.No computer codes still
Disconnect the MAF sensor to see if the idle smooths out.
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