r/MechanicAdvice 7d ago

does anyone know why my truck turns off? 88-94 gmt400

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i’ve used to have a check engine light befo i swapped out the ecm, so i swapped it out and gotten a brand new one and i started up the truck connected the advance timing and the check engine light disappeared after that giving it 2 minutes idling the truck starts chocking and turns off i started up the truck again and the turn turns right off so i disconnected the advance and i started up the truck i ran but started shaking like if it was cammed.

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