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Discussion Starter #1
My '65 289 has been running great! Now the engine surges, esp. at idle. So much so that it will actually stall the car. Recently replaced the fuel pump w/ a new Carter one because it was doing the same thing only to a lesser degree. I have the idle set up to keep it going, but what is up? Need help!
Thx, diArdi
 

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Have you checked the float level of the carb? If the float level is too high, it can cause a surge at idle when the bowl fills up.
 

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Discussion Starter #4
Yes, the Carter fuel pump has a fuel filter canister and like I said, I just changed it. Hmmm, how would I go about checking for too lean?
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If the surge started suddenly after the carb was working ok, then I would guess it's more likely that some crud/dirt could be the cause. Some little grain of gunk broke lose and is interferring with fuel flow/delivery.

What kind of carb?

I'm not that familiar with stock Ford 2100/4100. In a Holley you would want to check the needle/seat and the bowls for bits of dirt. Edelbrock would need the top pulled off to check the bowls and the jets.

Maybe time for a re-build on your carb. ;)
 

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Check for a vacuum leak.. could cause a surge by leaning out the mixture, make sure you check the throttle shafts for play and leakage also.. Good luck
 
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