maybe you shoudn't WAG. have you tried taking it to a shop and seeing what they think is the problem. Do you have any mechanically advanced friends that can take a look. If you are going to start replacing everything piece by piece just get a new engine that will solve all the problems for sure. try checking shorted wires? replace those too. tried pulling codes yet? try changing 02 sensor? Im not trying to be a asshole its just stupid to replace every single thing when you dont know that its the problem.
my 2cents
good luck
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1992 240sx 5 spd. - Sold / 02 Maxima Se
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