cudakid
Newbie
Have a 96 GMC 1500 single cab that was originally a 4.3. We blew that motor up so pulled a 5.7 out of a 97 Tahoe to swap in. Stole the wiring harness and all that out of it as well. Tahoe was running and driving before pulled everything out of it. Going to to try to start it but have no spark any where. No coil spark and then obviously no spark at plugs. Any ideas on where to start looking? Already changed ecms and tried a new coil. Anywhere else we should look for problems or any other things may be missing with the swap? Thanks