390 Doesn't get up and go from start

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03-18-2011, 11:50 PM

Greenford100

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390 Doesn't get up and go from start

So my 390 is putting out a little bit when I go to hit the gas, but once it feels like it starts to catch it goes just fine. Does anyone know what the problem for the intial stutter is? Thanks for any help.

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03-19-2011, 12:04 AM

arctic y block

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1) Accelerator pump in the carb?

2) Vacuum leak?

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03-19-2011, 09:05 AM

krewat

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If this is something new that's happening recently, when it USED to run just fine, check the vacuum advance.

I bet the diaphragm is shot.

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03-19-2011, 09:42 AM

69cj

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All three of the above will cause the same symptoms.

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03-19-2011, 06:28 PM

Greenford100

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Thanks guys. I put a new vaccum advance on a while back and it seemed like it was running better. I will have to look at the accelerator pump in the carb.

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