Ok here are the symptoms, see if you can figure it out.. motor is a 454 milage is unshure but likly 150,000 I think, carb is a 5 month old holly 670 truck avenger. truck has been bogging at higher speeds for the last couple weeks, I changed the spark plugs that where only a month old out and a couple were fouled out. Plug wires are newer too. Last couple days carb has been popping and kind of back firing, "I also did some manual back firing for fun before this started" if that helps. /forums/images/graemlins/ignore.gif then now its really bad, but a couple of short drives it acted normal and didn't do it at all /forums/images/graemlins/confused.gif I thought a bent valve but wouldn't it act the same rather than change how it acts? What about the accelerator pump? but the gas flow also looks inconsistant but would that have anything to do with back firing? Today I will pull the valve covers and see if the lifters are all acting the same or if I have some being inconsistant or different. thoughts? ideas recomendations? /forums/images/graemlins/1zhelp.gif also I noticed I am blazer of the month= ..thanks!