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Re: Engine won't decelerate on it's own
I had a similar problem with both the holley and edlebrock on another 350. The holley the problem was the auto electric choke wasn't hooked up and once the pedal was advanced it would hang open thus causing the higher RPM. Hooing up to a switched 12 volt circuit it idles fine. On the other carb the 4 mount nuts had worked loose enough for the carb to shift about a .032 of an inch to catch the rear plate and keep it open. That was on a performer intake. Rule out the springs and linkage first but check proper operation of your coke on the holley. Work the linkage to wide open n release see if everything returns to the proper position. Also Holley's web site does have a troubleshooting chart worth a look also. Good luck.
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