Thread: Carb stumble

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Is there a relationship between carb stumble at idle and valve lash? ie, intake too tight? or too loose?
With engine at idle and hit the throttle it will stumble (235 chevy w/ 1bbl carter) but i pull choke out some it will act ok - in brief if i restrict the air the motor won't stumle at hit of throttle. All else seems good, ignition etc. I was wondering if i have intake valve lash too tight nwill it show up as stumble?

I would look at the carb or carb gasket or intake gasket. by pulling choke out part way your restricting air with a gasket leak your getting to much air and it stumbles.

Choke can compensate for vacuum leak, as mentioned in previous post.

Also, a faulty accelerator pump will cause your symptom.

Originally Posted by firebird77clone

Choke can compensate for vacuum leak, as mentioned in previous post.
Also, a faulty accelerator pump will cause your symptom.

^times 2........

check for wear on the throttle blade shaft in the carb housing--those are old carbs and thats wear they where-----------

Ist make shue your carb is working right, the accelerator rod is tight so that the pump acuates as soon a you move the carb linkage. I had a 250 6 once and found that the linkage had worn just a bit and then you would have a stumble on throttle tip in as the fuel was not getting there soon enough . Make shure you are getting a good squirt also from the accelerator pump .

I appreciate all the response guys, but this is an old thread that somehow got reborn. I hate to see you pondering a a non-existant problem.

well---did you fix it???????????

yeah we wanna know