I'm working on a 97 Chevy K2500 5.7 SEFI with automatic trans. VIN 1GCGK24R2VZ239078. Cyliders 2,4,6,8 are not hitting at idle or 2500 rpm. Compression is 145-150 on all cylinders. Spark at each hole jumps 35k w/sparktester. Pulled upper plenum to check inject... Login to read more.