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Hello I just recently purchased a 2001 Chevy Astro Van AWD that recently had a engine from a 1998 GMC Jimmy swapped into it. the engine is a v6 vortec. The swap was done before i purchased it. What could be causing this misfire. the jimmy running perfect with the engine before the swap what do i do?
 

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There’s lots of articles in the search community box ,where everyone has shared there experience.
Is there a check engine light on? If so what’s the code?
 

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Common Sense + Critical Thinking
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If it was running perfectly before the swap, I would probably do a CKP System Variation Learn Procedure first.
 

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My neighbor recently swapped a different year Vortec 5.7 into a C1500. Had similiar issues. Had to do with computer pinout being different. Although I understand the concept I get lost on the details pretty quick. He figured it out, changed the pinout all was good. Had to do with the injectors I think (sequential?) but not completely sure.
 
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