Ok, replaced the O2 sensor, thats no longer an issue. Also, replaced both vac reserve cans, Still get the misfire under load. Pulled the codes... get a 32. EVP circuit below minimum voltage. At least I know why the egr wasn't opening... the vac canister on the passenger side had a hole rotted in it the size of a quater!

Still doing the misfire under load. I'm getting sick of this... maaybe time for a new truck LOL

-Bill