I do have a AFB that has a pcv port in the front of the carb that I could try but all I know is I need to shorten the hose to the pcv and see if it returns to the way I had it,I went up 2 sizes on the jets and it made a big difference and got rid of the pinging and got crisp throttle response but I am back to square one now. I am not going to go larger on the jets untill I get the spacer and shorten the hose but I did not think a longer pcv hose would lean it back out.