My '93 4.0 aw4 started dying on me a few weeks back. i did the key trick and found the o2 sensor code and the cps code. i replaced both. thought it fixed the problem because i didnt have the stalling problem for 2 days till just now on my way home from work. i still have the o2 and cps codes but now i also have a MAP code(13). should i just replace the MAP and see what happens? why would all these sensors go bad at once? i dies intermittently. im just driving along then it dies suddenly without warning.