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I have an 88 f150 4x4 5.0. Bought it 6 months ago. Drove great on the hour long trip home. A couple days later, my wife drove it to town. 5 minute trip. It died and wouldn't start back. A new distributor and it fired back up. But now it does just like the key was shut off. So far I've put new distributor, cap, rotor button, plugs, wires, coil, fuel pump relay, fuel pump, map sensor, tfi, heat sensor, ignition switch, fuseable link, starter solenoid. Ended up taking it to a shop, and they also failed to find the problem after having it for a week. Somebody tell me what to do before I burn it in my drive way!
then my next move would be to check fuel pressure with a gauge, and pull codes.
also, can you hear the fuel pump run for a second before starting, or does it run continuously if the key is in the run position ?
also, you say you replaced the ignition switch. do you mean the switch thats mounted to the steering column, up underneath the dash, or do you mean the ignition lock, into which the key goes (this is often mistakenly referred to as the ignition switch).
I've done those. Im very mechanically inclined. I know fords, been driving them for 24 years. But this one has me stumped. I'm the guy that has done a little bit of everything that others come to when they need their crap fixed lol. This truck beeen kicking my *** though. That's why I'm here, I'm looking for what I haven't thought of.
You bough a rebuilt distributor and most of them are bad and do this.
You need to either replace the PIP sensor in the distributor or buy a "NEW" distributor, not a rebuilt or remanufactured distributor and put it in.