Holley/Demon Carb stumble

But you didn't have it in gear:p
All kidding aside hope to get my Proform to be just a little bit more crisp. Going to start with dropping 2 or 3 jet sides.....
Last time i did that. I popped and banging in the exhaust so bad i thought it might come threw the floor boards........but that was when i had the Demon metering block in it.
Hopefully that will get me leaned down enough to start learning how to play with air bleeds or maybe it will require PVCR changed. I know the first step is main jets.

The Proforms o2s say it richer the the demon and i fill the demon is to rich as well. Demon around 12.5 and Proform 11s o2s when down to 11.0
When it was popping and banging the air fuel ratio was 13.5 to 14.0 at full throttle and couldn't get above 5 grand.

So i think 3 number down is a safe bet?????

If reducing the main jet makes it pop and bang, you are probably too small on the PVCR’s. Use the primary main jets to get the cruise as lean as you can without surge and and then correct WOT with the PVCR’s and the secondary main jet.