88 e-150 302eng.have put new distributor,coil,module(on side of dist.)rotor,cap,wires.all it does is fire 1 spark when first turn over and most of the time 1spark when it stops,but never any where in between.same as before i changed all the parts

Sounds like you replaced the distributor without setting #1 at TDC? The distributor cap should indicate which plug is the #1 plug wire. If there are no inspection plugs you can pop out to see the timing marks on the camshaft gears you will need to disable the starting system (fuel flow) remove #1 plug and turn it over until #1 piston is at TDC on the compression stroke. Then insert the distributor cap with the rotor on it, taking note of where the #1 plug tower is on the cap. Once the dist is installed place the cap on and make sure the end of the rotor is aligned with the #1 tower inside, if it is your good to go. If not take the dist out and turn it a bit left or right then put it in again until it lines up correctly (may take a few tries). Once aligned secure everything, replace spark plug and it should fire up.

the timing is 180 degrees out so ignore where no 1 lead should be and rewire the HT leads to the new position for no1 cylinder. The crank timing mark should be on 10 degrees advanced. Engines are timed off the crank position so forget the cam position.
Or you can start again. Remove no 1 plug and turn the engine over until you feel compression under your finger over the plug hole. Set the timing on the crank to 10 degrees before tdc. Position the distributor so that the point of the star is directly opposite the exciter coil in the distributor. The rotor button should now be facing no 1 cylinder plug lead adjust the HT leads so that they will fire in the 1342 firing order. Start the engine and with a timing light attached to no 1 plug lead adjust the timing mark to specifications by turning the body of the distributor.

I would look into replacing the coil even though it is sending spark it might not be enough and I would go through and just double check all my wires as well as the firing order because if it's off just a little it will make the car run rough

Do you getting gas?fuel filter,fuel pump.

If you can tell me what color the wire is I should be able to tell you where it goes.
But if you are getting spark from the coil tower the primary ignition system is working.
Have you checked the coil wire, and will it fire a plug ? The coil could be weak enough to fire a plug in open air but not in a cylinder under compression.
You do know for a fact the distributor rotor is turning, right ?

I guess you could have the ignition analyzed on an oscilloscope. Maybe a tech could see something then.
I always heard the only gap was the spark plug gap-the rotor has no gap-are you sure you got the correct rotor? And does it touch the top distributor cap coil wire tower?

Let us know. It is a mystery worthy of a solution.

try changing the pickup coil in the bottom of the distributor

you said you repl dist cap that means you don't have a crank sensor you have electronic ing module. remove your elec ing module have it tested most auto parts stores could test your module, or check your coil at the neg terminal. should have power. if not you lost your primary volt from your batt.your secondary power is coming from your electronic ing module from the module to the pos terminal on the coil, when the eng cranks,from the coil to the dist cap , from the dist cap center to the rotor then out to the plugs,this all happen pervided the timing belt or timing chain is ok. the cumbustion chainber needs 3 things , thats fuel, air, and spark.

the dist pick up is bad put new dist should shovle prob

I had the same problem with my 85 cj7 this week, I relpaced the ignition control module, plugs, wires, cap, rotor and the the coil; still had no fire to plugs. the problem turned out to be my distributor, replaced it today and she fired right up. Most likely it was the pick up module in the distributor that went bad.