[mtnerman]

i have a weber 38 carb and it starts up fine but then i go to drive it and come to a stop and it idles low and cuts off, then other times once the truck is warm the idle will be all over the place like 1200-1400 then other times it will go to 1000 RPM's idle.. what gives??

 

[Arnold]

First thing I'd check for is vacuum leaks especially if you're using the 2 piece manifold adapter plates.

 

[dirtytoy]

if you over tighten the allen bolts on the second adapter they will break the second piece, ask me I speak from experiance.

 

[dcg9381]

Suspect vacuum leak also..
spray the base of the carb with carb cleaner.. listen for a change in how the motor runs.

 

[mtnerman]

i dun fixed it.. it was vacumn related.. thanks guys

 

[SammyIammy]

I know you posted this a while ago but where was you leak!?? Im having a similar problem. Thanks