ok i drove my truck on the highway yesterday on the way to look at that k20. my dad was driving adn wanted to see how it ran with the new intake and carb. when he stomped it and it wound up to like 4300 in 2nd, the whole truck would like surge back an forth. sort of like a misfire or fuel starvage. it did this in 1st gear and 2nd gear... anythoughs on what this might be? the plug wires are kinda cracked from getting toasted on the headers. but not burned through to where they arc on stuff...could there be enough "electical pressure" to at this rpm range they Could "jump" out and cause a misfire? its a 350 hei, msd, standard fuel pump, edelbrok airgap performer, 1406 carb, and gm performance 290hp motor. im thinking that the "standard" fuel pump isnt enough for the motor. when i put it in i just bought a stock filter for an 84 blazer.