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Old 10-27-2010, 09:25 AM
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Engine Idle issues.

Hey guys. want to pick everyone's brain out there about a small issue I am having with my newly acquired project. I have a 72 Chevy p/u that has a 350 v8 with a Edelbrock carb that was installed on it before I bought it. I don't know a whole lot about carbs other than adjusting the idle speed and a bit about rebuilding them but nothing about adjusting anything else. the truck is running well and drivable so I am pretty sure the mixture is where it needs to be if not close. My issue is the idle speed, when I first picked up the truck from the guy I bought it from it was idling really high, and punching the pedal to get the idle to drop was not working. The carb has an electric choke and now when I start it and run it it goes down to a nice idle speed but it seems that every time I give it gas to go somewhere and then come to a stop it is idling high again and I have to give the throttle a quick punch to get it to go back down to idle and it is fine till I give it gas again and then come to a stop or push the clutch in .

What might be causing this and what do I need to look for next time I am tinkering with it. I am having no problems with the engine running or starting, it fires up pretty quickly. just tired of having to hit the throttle every time I come to a stop . any suggestions?

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Old 10-27-2010, 09:47 AM
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other people on here will be able to give much better info than I can, but it sounds like it might have something to do with the choke.
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Old 10-27-2010, 09:53 AM
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Start by checking the linkage . It maybe binding or need adjusted to give it a little free pedal .
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Old 10-27-2010, 11:40 AM
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Check the linkage, check the throttle return spring is tight, possible sticking weights in the dizzy, vacuum leak?
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Old 10-27-2010, 06:17 PM
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Check the tension of the mechanical advance springs in the distributor.
The light tension springs from typical advance curve kits are inconsistant.
There is a better way to recurve the distributor that uses much more stable,consistant performing medium tension advance springs.
The idle will be much more consistant the throttle response will be much better as well, once the distributor advance curve is set up correctly.

There is more to it that just installing the lightest springs.

Does this motor have a high perf cam in it?
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