Truck runs great until it warms up,but then almost seems like it is running on 4 cylinders? and then dies?
SOURCE: engines idles rough and shuts off
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: 2000 Ford Explorerer rough idle When cold
what codes are present? If it is lean codes P0171/P0174 problem is most likely the orings leaking between upper and lower intake manifold if this is a 4.0L
SOURCE: 2003 f250 diesel 6.0 hard start when cold, idles
It sounds like your preheat system is not working properly on the cold startup. Haynes has a Diesel Engine Repair Manual, part #10330 that will help you correctly diagnose and repair.
Battery volts at 13 is good but a fully charged battery should be close to 14.2. It would be a good idea to get the alternator output checked and a load test done on the batteries.
Hope this helps.
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