I have a Coworker whos truck started running rough due to clogged cats so he removed them.
Now his gas mileage went way down. I'm going to be turning off the Catalytic codes its a
2002 Silverado with the 5.3 Vortec, Haven't messed with Gm's yet and I read somewhere that
on those you need to disable something else so it doesnt dump fuel in to try to cool the cats?
Sorry for the Nubquestions any input would be helpful.
What all should I disable/no report error?