Master mechanic of 40 years and I put in a 1979 L-28 with 80k miles into ,1980 280zx, we used same rail injection and distributor as old blown head gasket L-28. Have tried to figure out why only hitting on 5 cylinders not 6.. Injector and spark timming are perfect; but just cannot get #1 cylinder kicking in-it has good compression. Am hoping it is not a burnt valve; but at a very big loss as to what it could be-hopefully something simple; maybe electrical. MAF, and sending units seem to be working properly. Thank you for looking into this as we are very stumped here!