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Truck not running properly

MikeRay79
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MikeRay79 New Member

MikeRay79

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I have a 93 C1500...I just rebuilt the engine...when I go to take off, it's like it goes from 1st to 3rd, wants kinda "buck" but if I floor it, it downshifts and takes off, runs fine....no check engine light comes on. It is a TBI with a 4L60E. I am stumped.

Perhaps the timing isn't advancing like it should...I have video, not sure how to upload it.

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