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I would use Nissan Datascan to see what is working and start from there but that requires Nissan Datascan and I wouldn't know much about another approach because I bought Datascan when I had use for it (idle and timing) and it can be done without but it is harder. Nissan Datascan can be pretty useless in some cases but here I recommend looking up everything that is still good instead of pinpointing the defect.