okay, yesterday i went out and started checking wiring harnesses for chaffing or damage, and i didnt find anything. i then started checking voltage from the ignition switch back to the IPM. had voltage to the starter relay, but found that there was no ground being applied to that circuit through the PCM. i am assuming that the PCM gives or takes away the ground to control many of these circuits this way? if that is the case, then the PCM is for some reason not giving a ground to the starter relay, therefore when i turn the key, the starter wont even make a sound. in the middle of doing all these checks, i turned the key once, and it started out of the blue....5 different times!! it ran for a good hour or so, then the 6th time i tried to start it, nothing....the same thing again, no ground through the PCM. i am not sold that the PCM is bad. my question is: what inputs to the PCM would take ground away from the start relay in this manner? i understand it takes many inputs and adjusts different circuits accordingly, but what would make it do this intermittently? would a cam sensor actually take out the starter like this? crank sensor? since i cant find a diagram on the internal makeup of the PCM, i cant see what would actually cause the ground to be taken out of the start circuit. help??