So the truck has been having some issues misfiring under moderate load the the beginning of the gears. I replaced the cap/rotor/plugs and it helped slightly. Next I plugged the egr line running to the TB (after the electrical part) and it seemed to run very good. So I picked up an EGR valve, pulled off the old one and it seemed to work fine, but I went ahead and just put on the new one. And since then it's running worse than ever, after it shifts to a new gear I have to baby it up in speed or it just falls on it's face misfiring. Before it would do that a bit around town, but wouldn't fall completely on it's face, and on the freeway I had 0 issues with it. Now it even has some issues there. Any ideas?
Also it is a 91 5.7L K2500.
Also it is a 91 5.7L K2500.