Hey there! Thanks for adding me to the forum. I am fixing up a 93 Chevy k2500 with a 5.7 TBI. I am getting it pretty close to good but it hasn't run right since the PO swapped in a crate motor and put headers on the truck. They also seem to have deleted the EGR and there is no cat. I'm thinking that the lack of the post cat o2 sensor and EGR are contributing to this so I'm looking at getting a chip burner and modifying the tune to get thus thing running right. Looking forward to learning from you all!