i have a k 2500 with a 5.7 it ideals rough on start up an first take off till it warms up then it runs great if i unplug the egr valve once you start it cold and rev it twice its fine an runs great but i dnt understand the egr system so is it the valve or sylnoid causing the issue or am i not seen the real problem all vac lines look good and tight by the way new plugs wires dist cap an rotor ran all diffrnt throttle body and injector cleaners and trie higher octane gold any suggestions much appricated
