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The most affordable place i have found to work on the 96 and later motors is Jims Performance. www.jimsperformance.com. I had him do a 5.7 vortec harness and ecm cleanup about a year ago for me and he was about 1/2 the price of anyone else for harness and reflash work, and my harness looked better than any "painless" harness ive seen when i got it back. And he will talk to you and answer all your questions. Probably one of the best vendors ive ever dealt with. I am not sure if i am sending him my 4.3 harness though. I might take this one on so i am more familiar with my motor. Well see. You have to atleast do something with the ecm though. It might be worth your trouble to see if a junk yard will let you trade your 98 for an earlier(96-97) ecm that was used with the same tranny as yours. I dont think you can find someone to delete VATS for less than $150. And i know you can buy a ecm for $75.