Hey guys new here. My 99 started acting up a month ago. Started with map sensor fi code. Vacuum was off. Put it back on same thing. Runs bad. Checked all vacuum lines, good. Replaced sensor runs bad. Basically did all the obvious plugs ,gas fuel filter, checked connections . Sprayed throttle body. Heres the kicker. If you can get it started then remove the map vacuum, it runs great. Wont start back up with vacuum removed. Any thoughts? This is driving me nuts! Thanks!
Maybe a damaged wire/connector leading to the MAP sensor? Might pay to check for continuity down the wires from the ECU connector.