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i have a 90 z24 3.1, runs like shit constant miss on any rpm. has no power or pick up. the cat converter gets soo hot after 6 miles its bright red. i dont think im getting fuel to the intake. i think some injectors are bad. they arent clogged cayse the last 3 tanks of gas i have had the cleaner in it. plugs are new. wires are on the way. inigition seems fine to me and the mechanic said it might be injectors but it would cost a lot of $$$. Has anyone replaced them before on this engine? i knowyou have to take off the plenum and all that shit to get at them but the other than that it should be relativly easy. chiltons says i need a tech 1 scan tool? why? and do i really need it? or would the idle relearn procedure do the same thing? thanks for the help