Fuel filter is plugged or fuel line is cinked, after highway driving where fuel flow is greatest the pump cannot maintaine the flow and engine "runs out of gas" after an hour the fuel line is full again by gravity.
Run with a greater than half a tank until you get it fixed
You might have a faulty TFI (Thick Film Integrated) ignition module. Sometimes it is located on the distributor and sometimes attached to the engine compartment of the vehicle. If it is damaged and becomes overheated, the module will intermittently lose power as it heats up and then finally die on you. It takes about an hour for the module to cool down.
My guess is the fuel filter and or pump. the faster you go, the more fuel your engine requires. Thus, if the flow is restricted your engine may stall.
Symptoms indicate the timing chain broke or came loose.
Your transmission seems to be slipping, serious problem!!! See mechanic ASAP, you don't want to get stuck on the freeway & can't move, not a good situation!
Hmm... while driving, and/or intermittently? Or has something really gone south and the car just has no guts ever? Can you be a little more precise? FriPilot
Change the fuel filter first.
The belt that drives the alt and p/s is loose. If it is a serpentine belt, check the tensioner or replace the belt.
Check for a loose power steering belt.
NEED MORE IMFO TO ANSWER
It sounds like your vehicle lost electic power, could be caused by a faulty ignition switch, or loose battery cable. Could also be a bad crankshaft position sensor.
It sounds as if you have either a power or ground problem at the motor.
The # one problem with today's cars is fuel pumps ; this sounds like one.As the pump gets warm,it loses power. Do have it checked out.
The power button is a form of overdrive. It drops the transmission one gear down. Handy for passing or entering the freeway when you need a little more power and acceleration.
My 1986 4WD pu intermittently had low to no power and it was due to the fuel pump. Replaced the pump and it ran fine.