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Discussion Starter · #1 ·
I have a 93 C1500 that had a 4.3 which blew up. I found a 5.7 and swapped it out. At first it would start but would idle rough. Now it'll just crank and crank but won't fire. It's getting plenty of fuel from the throttle body and plugs are firing. Any help or nudge in a directing to fix it would be amazing! Thanks
 

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Are you running the correct computer?
did the 350 run before the swap?
did you swap any sensors?
 

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Discussion Starter · #4 ·
It was a junk yard engine that they said ran like a top, all connections are fine. Correct ecm and I am using the old coolant temp sensor from the 4.3 but they're the same sensor. Lots of fuel and lots of spark
 
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