Holley/Demon Carb stumble

mderoy340 said

Throttle plate and main body idle and transition passages are not the same as a Proform/QFT/Holley.

Click to expand...

And that could very well, be why nothing fix my problem untel i add the proform metering block to the proform base plate and center section.
I don't know.

So what make you think the base plate is different between the proform and the demon?