I've got a 1995 K2500 4L80E 8600GVW truck that originally had a 5.7L in it and I've put an old school 406 in. It runs now, but has horrible mileage and huge dead spots. Mixture is pretty good, it's mostly timing that needs adjusted. Looking for someone to burn me a custom chip (and anything else that goes along with that). I'm not interested in aftermarket EFI, nor am I interested in purchasing my own burning equipment. Looking for something that's pretty much plug-and-play.

Thanks for your help!