I am going to assume that you either have 5.0 or 5.7 liter engine. (305 or 350) If you are up to it, you will need to pull a spark plug wire and if you have an old plug laying around stick it the boot. Now rest the metal part of the plug and have someone start the motor. If you see spark I would have to point to the fuel side of things. If not, then would look at the Ignition. I would have to say if no spark then the module in the distributor is bad. Under the cap is the module and they have a dendance to take a crap. Mine was on the highway 30 miles from a nearist town. Replace that and also make sure you use the white grease that it comes with. Helps remove the heat from the module. Also I would replace the cap and coil. It will help on the module cause everything is fresh. Remember this when replacing the coil, you will need to pay attention to the color of the wires that is on the coil. Different ohms for different colors and voltage will variy for spark output. If fuel is the issue, change out the fuel filter and check fuel pump for pumping fuel. If you have dual tanks, do you use the left and not the right? I have seen wear the tank selector is set up that if it fails then it draws fuel from the right tank. If no fuel is pumped, you could have a bad pump. I hope this will help on trouble shooting your problem.
Start with changing the fuel filter.
footbrake deactivation switch
Does it have a miss? check plugs and wires. Also a possibility of a bad throttle position sensor.
do the bolts on a 1990 pickup truck go in vertical or horizontal
try the pickup coil under the dist. cover.
Check to see if the 4x4 is engaged
could be fuel filter
You did not have to apply the brake on a 91 model to shift it. There's nothing wrong.
Air in the PS system, loose belt or a tired PS pump.
Either the thermostat is not working properly or the temperature sensor is displaying wrong on your gauge.
if its a stick shift and ur shifting it wrong then mabye that's why
your alternator is dead.