Ok thanks guys I think just to eleviate the confusion i'm gonna get a pcm from an 04 van those are easy to find. I'm mainly wondering about the wiring harness, can I use a dbw wiring harness on a dbc pcm? Like if I got a harness from a 5.3 silverado 2004? I heard you can use the dbw wiring and wire up the iac and tps. Not 100% on that though and if thats the only differences in the dbw and dbc harness's.
And thanks for the tune offer but i'm planning on buying efilive so don't think the tunercat would work.