Edelbrock 650 Thunder Series Carb... Issues! HELP!

the secondaries are controlled by an airvalve that can be adjusted...
open too soon...bog and stumble... especially from idle or low speed ...not enought air flow ...

tighten up the spring..

also check your acelerator pump...see that is is squirting gas as soon as the throttle is moved...also check to see how big the pump shot is...move the rod to get the most pump shot...

and then what size squirter do you have?