Hey all, I have just bought a 1994 k1500 Z71 ext cab I did a minor tune up and now i have an issue, when im driving and i have the rpms at around 1500 to 2000 its starts to sputter back fire and then all of a sudden it pops and i get a huge power surge and the truck runs great for a few min and then it does it again i also feel a great power loss when the sputterin starts i have changes just about every thing as far as ignition to the motor goes except the icm but maybe im missin something any help would be appreciated, at my wits end.
