Hi, glad to find this forum! I've got a 90 GMC Sierra K1500 it's got a 6" RCD suspension lift, 18x9 Ultima Hunters with Toyo Open country 33x12.5. The engine has a 1" TBI throttle spacer, and 3" to a flow master 40 series exhaust. I want to get a custom burnt chip for it and would like some recommendations. I've tried JET performance and it ran ok but then started to run ugly.