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johnyoung · 05-31-2015, 05:13 PM

Fellers I have a real problem on my hands. 09 - 5.3 out of a 2 wheel drive chevy , brand new motor and trans with 900 miles on it. Install went great in my 67 SB pickup. Problem is when I start it up it revs to about 3000 rpm's then slowly comes back to idle. It even does it when I stop and put it in park and rev her up a little - I called the guy that does my harness's and computer and he has never heard of this. Replaced the throttle body twice - no change. Any ideas will be greatly appreciated.

05-31-2015, 05:13 PM	#1
johnyoung Registered User Join Date: May 2010 Location: London, Kentucky Posts: 88	Engine revs up when starting Fellers I have a real problem on my hands. 09 - 5.3 out of a 2 wheel drive chevy , brand new motor and trans with 900 miles on it. Install went great in my 67 SB pickup. Problem is when I start it up it revs to about 3000 rpm's then slowly comes back to idle. It even does it when I stop and put it in park and rev her up a little - I called the guy that does my harness's and computer and he has never heard of this. Replaced the throttle body twice - no change. Any ideas will be greatly appreciated.