I can relate. New motor swap in my 97 Cherokee. Had spark and fuel. Injectors not firing. Checked EVERYTHING!! I even have the service manuals. Took me weeks to figure out. Traced it back to a missing airbag relay. Jeep ran without it but once I reset the computer for the new motor, ECU needed signal from airbag system. Fired perfect once I put in the relay. Scared the hell out of me. Didn?t think that would be the issue.


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