so my pf4 system has been doing good on my truck and i feel i have a solid base tune to start playing with the unit . i notice my exhaust if i idle to long gets a hair bit puffy but nothing a few blips of the throttle dont clear up . is this to rich ? seems to smell a bit like it . i am 13.8 afr @ idle / 14.0 @ cruise / 12.0 @ full throttle for current settings . i did back the cruise down a bit as it was in the mid 13.xx range and this seems to help it not ping hardly at all much any more and i think fuel mileage went up a hair . and good tips or tricks to play with guys ?