05 Nissan frontier 4x4 4.0 automatic. When u crank the truck and put it in gear it holds gear good for about 10-15secs then its like it goes to neutral. You then can turn the ignition off for 15sec then crank and put it gear and will pull for 10-15secs and stop pulling again. Any help please

SOURCE: in order to put my 1994 lincoln towncar in gear i

Sounds like the "shift lock actuator". It's a common Ford/Lincoln problem. It's basically a safety device to ensure the car is turned on and your foot is on the brake b/4 you can place the car into gear. Here is a gr8 piece describing the problem
" This is a problem with the Shift Interlock System and not the transmission. Bet you're glad to hear that. The Shift Interlock System requires the key to be in the "RUN" position and the brake pedal depressed in order to shift out of "PARK". This is to prevent possible vehicle runaway. There are a couple of possibilities here. The first is the Brake Pedal Position (BPP) switch. You can usually tell if this is bad if you have no brake lights at all. Another possibility is a bad Shift Lock Actuator or Shift lock solenoid, located under the console.
First thing to do is check fuses 28 and 32 in the fuse box, if you haven't already done so, and make sure they are good.
To check the BPP switch, check for power at the light green/red and light green wires with a test light with the key in the "RUN" position and the brake pedal depressed. If you have power there, then check for power at the light green wire at the Shift Lock Actuator.
f you have power at the light green wire at the Shift Lock Actuator, ground the black wire. If you hear a click, then you have a bad ground and it needs to be repaired. If not, the Shift Lock Actuator is bad and needs to be replaced."

I hope this give you a better understanding and I wish you the best of luck with your problem.