Hello everyone I just came across the site today while searching the net for some help with my truck.. I have a 1990 F-150 4x4 5.8L .. one morning it decided not to start and the fun began... I put an ignition module on it right away having seen that be the problem before.. No dice... I noticed some green in the bottom of the EEC and Fuel Pump relays so i cut them out and replaced the connectors and the relays...still nothing... I noticed the fuel pump running constantly with the key on ... at this point i had spark and fuel pressure but no injector pulse... so between no pulse and constant running pump i took a chance on changing the PCM.... So i put the new computer in and she fires right up and runs for about a minute and a half ( im all happy at this point) until boom it cuts out and wont restart (not so happy anymore)... Now i have no spark and no injector pulse... i took the connector back off the computer and tested each power and ground point and they were all good so i hooked the computer back up.. The EGR and TPS both have a nice 5volt reference with the key on... Now to throw a curve ball in the mix she will start some times and runs great(the new comp actually fixed a tranny shift problem i was having) and if you get it to start it will continue to restart all day and night..however once she sits over night and i assume gets colder it will not start again in the morning.... if i wait till mid day when the suns hot she will start most of the time... I have had every connector apart on the drivers side fender well and also the large round one going through the firewall and still cant find a bad contact... I have also checked the pickup coil in the distributor and she is showing a nice square wave pattern .... Also when it has the no start condition it will not communicate with the scan tool but when it does start it will ... its driving me nuts and any suggestions would be much appreciated.. Thank You - Frank :mad5: