I have a 1996 f150 4.9L engine e4od transmission single cab long bed. It is throwing the following codes P0171 P0174 P1150 P1130. When I drive the vehicle for longer periods over 20 minutes sometimes when I’m stuck at a red light or in heavy traffic when I’m hardly moving the engine will sputter, if I’m unable to increase my speed it will sputter all the way out. When I drive for more than 20 minutes and turn off the truck I’m usually unable to start it up for about 10 minutes, if I try to start it before then it will turn over and usually sputter out or just barely start. Fuel pressure is 33 psi at idle but I haven’t been able to check the pressure when I’m having the issue yet. Replaced the rear fuel pump and fuel filter about a year and a half ago. Had dual tanks but one was leaking when I bought it so I removed the front tank and sealed off the lines, that was about 2 years ago I’ve only been having this problem for the last 6 months or so.

 

To respond from the other thread, my fuel pump was replaced about 2 years ago when I deleted the rear tank. It failed with those same symptoms I stated 2 weeks ago. Its either lack of fuel or fresh air being introduced that’s not accounted for. You have a MAF truck?

 

yes it is MAF. Try MAF cleaner on the sensor? Or see if the idle improves with MAF sensor unplugged?

 

You can do that next time it’s acting up. Cleaning it typically never hurts. You can (carefully) use a heat gun or blow dryer to heat the maf up and check voltage or see if it starts getting worse when you do it. Electrical parts, especially on their last leg, hate being hot. You’re trucking to mimick the fault in is condition it does it.

The ecm could potentially be it also. It wouldn’t hurt to pull it and check the capacitors.