Originally Posted by Blazer3664 It does say "PROM I/O succeeded" if I hit "Read chip" now though. Good! Then Verify Chip with Buffer should come up with Success! 4096 Byte is 4 Kilobyte so... Open the file in TunerPro with XDF loaded and check Mask ID, should say 42. EDIT: Do you have chip at bottom of socket furthest away form handle and notch facing handle?
1990 Chevy Suburban 5.7L Auto ECM 1227747 $42! 1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner! -= =-
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