Alright fellas, Truck was running fine yesterday, but this morning, i went driving down the road, and it backfired in the carb and it kept doing it. I just had it "professionally" tuned about 3 weeks ago. I am in the process now of checking all the plugs/ wires. There is a definate smell of fuel, like it is burning rich...could this cause the backfire? Also I believe i am gonna have him recheck the timing tomorrow. You guys have any Idea on how to adjust the mixture on a Holley? It should be the screw with the spring on it right? Your inputs would greatly be appreciated! /forums/images/graemlins/peace.gif Rock ON!