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Old 10-18-2019, 10:54 AM   #1
Vegas Bound

 
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Idle RPM up and choppy

I don't drive my car often, 14K miles in 7 years. But when I do, it's hard miles at the drag strip.


Wednesday, after a couple passes, my idle RPM jumped up to 1200 while in gear and felt a little choppy.


I put the car on my trailer and took it home.


Any idea what it could be? No CELs.


And no, I don't have a data log.
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Old 10-18-2019, 05:10 PM   #2
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No advice sorry, just hope you get it worked out
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Old 10-18-2019, 05:25 PM   #3
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Snapped the throttle shut at high RPM, timing jumped a tooth? Just a guess though
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Old 10-18-2019, 06:52 PM   #4
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Snapped the throttle shut at high RPM, timing jumped a tooth? Just a guess though

Possible but I hope not. Don't want to tear the front of the engine apart.
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Old 10-18-2019, 06:53 PM   #5
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No advice sorry, just hope you get it worked out

Thanks.
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Old 10-18-2019, 08:36 PM   #6
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You give us little to work with....dont expect much in return.
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Old 10-18-2019, 09:21 PM   #7
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You give us little to work with....dont expect much in return.

Sorry, it's all I got so far.
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Old 10-20-2019, 07:42 PM   #8
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Vacuum leak?
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Old 10-20-2019, 08:53 PM   #9
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Vacuum leak?
That was my first thought. Vacuum leak will rob boost, my power was down. Logical thought. Unfortunately, I can't seem to find where the leak might be. Going to take it in to a local shop for a smoke test and check out the computer.
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Old 10-21-2019, 07:16 AM   #10
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Vacuum leak would show itself in your fuel trims.
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Old 10-21-2019, 08:31 AM   #11
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Sorry, it's all I got so far.
You haven't told us which engine or anything about your mods.
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Old 10-21-2019, 11:18 AM   #12
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You haven't told us which engine or anything about your mods.

Boosted V8.
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Old 10-22-2019, 09:15 PM   #13
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Did you check and see if there was oil in the plug hole ? That will and can cause a misfire. It comes from a leaking o-ring in the valve cover . When I changed all my plugs some had a small amount but I have heard of some leaking badly enough to cause a misfire . Just a thought , pull the coil off and look down in the hole to see .
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Old 10-22-2019, 09:16 PM   #14
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Never mind , you have a V8 not a V6 .
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1970 Impala 2D 350/300
1972 Buick GS 350
1967 Pontiac Firebird 326
1969 Chevelle SS 396/375 I really miss this one
1966 Chevelle SS 396/350
1978 Plymouth Fury 440
1982 VW Scirocco ( Got married )
1987 VW Scirocco
1992 Ford Taurus V6
1996 Dodge Intrepid
2002 Dodge Intrepid
2002 Mercedes ML500
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