Glad you found us, hope we can help. Your tuning knowledge will transfer over quite nicely once you get the learning curve done. Great introduction but really to many questions. Like your 1989 will be a differant ECM then the 1993. Getting the numbers of ECM and BCC of chip would be first step. Just start a thread in GM EFI forum and we will help you get going. First thing is always mechanicle. Is your truck in good shape maintenece wise. Fuel pressure check is always good too. Then learn to data log to see where your stock tune is.
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