1227747 TBI trucks generally from '87 to '91

• Programming 101 (focuses on GM 1227747 ECM)
• Tuning tips for the tables in the '747 ECM
• 1227747 used for spark only, on a carbed engine
• Closed loop fueling strategy used by the '747

1227747 ECM pinouts: Page 1, Page 2, Page 3, Page 4, Page 5, Page 6, Page 7

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