I have been running a Holley 700 DP and decided to buy a proform for a little more air flow. I put it on and have been having problems with it stumbling off the line. I have done everything I can think of to get it out, but nothing seems to be working. I have jetted it up,went up on the accelerator squirters and cleaned the crap out of it. I bought a 50cc accelerator pump, but I havent put it on because I would hate to waste $50 bucks and that not cure the stumble. So before I try that I was wondering if there is something else I should try?

I do have a one inch phenolic spacer on it too. I even tried taking it off thinking I was getting to much air flow, but it still did the same thing.

 

Try a 8.5 power valve.

 

i assume you have an auto trans., you should put the 50cc pump in and change the cams to tune out the bog.

if you have a manual trans you dont need the pump.

also if you could get a vac. guage or know someone who does that would help you select a power valve.