I have a n/a 1990 300zx M/T with a vg30de the car starts and runs, but it seems that the 1st and 6th cyliner arnt working i unpluged the coils and it had no affect, i was told its either the ingnition coils or the fuel injectors i know its not the coils i assure you. I did a full tune-up but didnt change the pcv plugs (i Will but is it important?). the car drives very sluggish and when i giggle the fuel injector wire-harness the car sputters also it revs at 2k rpm after i have been driving a while...what should i do first? i hope you have the answer to my question im dieng to get it fixed i hate driving a rice burner i will do anything to get this problem fixxed!!! also i unplugg the tps and nothing happens is this bad?