Idle stumble

If it's surging you might check for a vacuum leak ....maybe with your new pcv valve.

Just an idea

batman,,after switching to a pcv system your carb is now experiencing a controlled vacumn leak,,controlled by the new pcv valve.:clonk: You may need to only readjust the idle mixture screws and reposition the throttle blades (reset the idle stop).:thumbsup:
What brand of carb do you have ?

Hope this helps,RED67

To check for vacuum leaks you can spray around the base of the carbureator with starter fluid. If the engine speeds up its an idication that vacuum is sucking in the starter fluid at that point.

My Holley had leaks at the throttel blade bushing and at the back of the base plate, where the car would hardly idle. Replaced the base plate with a Proform and all is good now.

RED67 said:

batman,,after switching to a pcv system your carb is now experiencing a controlled vacumn leak,,controlled by the new pcv valve.:clonk: You may need to only readjust the idle mixture screws and reposition the throttle blades (reset the idle stop).:thumbsup:
What brand of carb do you have ?

Hope this helps,RED67

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I did that already.No luck

Can you switch back to your previous configuration and see if the problem goes away?

DriveWFO said:

Can you switch back to your previous configuration and see if the problem goes away?

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I could but my breathers are all packed away and I don't know where they are??bm

Disconnect the PCV hose from the carb (or intake) and cover up the fitting with a rubber cap (or whatever you have laying around that will seal it). See if the car still acts up.

72GreenRally said:

Bruce, maybe it is just feeling naughty, and needs a little discipline.

When are you leaving for the Big Sky Country? If it is real soon, I would wait until you get there because you are going to have to re-tune for the much higher altitude.

Randy (my .02 cents, which is almost worthless!)

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We'll be leaving in about 6 weeks(I hope).When I get up there I'm thinking of pulling the 350 and stroking it .bm

batman09 said:

I'm thinking of pulling the 350 and stroking it .bm

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If you stroke it, it will get bigger.

Randy (It's all Zinloi's fault!!!)

Sounds like some kinky stuff going on there. Ya know, it just might be my fault this time.:beers:

Don

Dejavue I seem to remember reading something similar to this before??

Maybe it IS Dons fault!! BM, send Xinloi the bill!:clonk:

NIGHTSHADE said:

Dejavue I seem to remember reading something similar to this before??

Maybe it IS Dons fault!! BM, send Xinloi the bill!:clonk:

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No problem Bruce...Just send me the bill.....attached to your Nova so I can inspect it and make sure all the work was done properly.:thumbsup:

Don