I have a 2001 20'Glastron with a 5.0L Volvo SX. From 3/4 to WOT it
makes a loud Pop...Pop...Pop in the Carburetor. It does a pop about
every second. I have replaced the Power Valve in the two Barrel holley
Carb and rebuilt the carb but it did not change or fix the problem.

Any Ideas on what could be wrong?

Kevin