Fixed it! (I think)
Since one of the codes the ecu was throwing was maf sensor, I replaced it with an E60 Maf from a 96 Maxima. The car now runs pretty well. I guess when I was replacing the maf with know good ones, it shows no effect, because of injector vacum leak. The tach is from a dohc, actually this is my second cluster to do this. I think I am going to recheck the dash harness wires that are spliced at the ecu. Or could this be timng?
Thanks for everyones help.
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