Its likely getting to hot I would remove the E.G.R valve off and look for carbon clogs in the passages sometimes there is a screen you can get chunks of carbon it depends on how well the engine has been running in the past .
SOURCE: truck starts, dies. truck runs good some days,bad the next
I had the same problem with My 1990 F150 300 6cylinder 4x4.....I cahnged all the same things you did, finally I sprayed a can of Gumout through the throttle body and it worked and ran great. Now I add fuel injector cleaner to the gas and a regular clean with the gumout and the problem has'nt come back. Good Luck to you and hope it works!
SOURCE: truck runs fine dies while driving starts up runs fine untill....
Have the fuel pump checked it may be weak.
SOURCE: our truck just died and wouldnt start. we
diesel or gas engine. if you have a power stroke, look at powerstroke.org
SOURCE: MY Ford F-150 cranks but will not start. Check
Are you sure the spark is sufficient? I have seen weak coils cause your problem also bad coil wires loosing to much voltage to the distributor.
SOURCE: 94 Chevy 1500 truck, seems to be getting fuel,
These sometimes have problems with the magnet on the distributor shaft loosing magnetism. This causes the pickup coil not to be able to produce a strong enough signal for the ignition module and the engine dies because of no spark.
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