Recent content by Betitseasy

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    The Stupid Engine Questions Thread

    I'm not 100% about it, but a few people including me have the same dilemma with the extra wiring. After discussing some GMT400 history we concluded 1 set is for TBI engine components, and the other is for the Vortec. I have a 5.7 TBI, pre-cat O2 sensors, pick up coil and ignition control module...
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