How do I fix this, when starting my truck,while cranking it,it will spark like once and not spark continuious,or at all, we've gotten it finally to this point, what to do?

Make sure you're getting spark at the spark plugs. You can do this by arching the plug to the engine block Just Google "how to test spark plugs". If there is a spark then it could be your timing, which is what happened to my wife's car, once we replaced everything, this was the final thing which solved her problem.

is the check engine light on--if so have it scanned at the local auto parts store to determine fault---maybe tps but check first then spend the cash---- could be crank sensor if cam sensors have been replaced but check first always---SMP

check for spark at the plug lead while cranking engine

does it crank and not start. do you know if gas is going to the engine. is there a buzzing noise in the gas tank when you turn the key.do you have spark to the coil

You have got to isolate your problems one by one. Is your crank position sensor working? Yoiu can test it individually or you can plug in a diagnisis interface and crank enine in a raltime test mode and measure engine RPM. If sensor is ok you get revs recorded and you go to next step i.e getting spark at the plugs. The spark is also a series of wiring and interfaces so you start from ignition switch itself to the ICU, power output stage and coil packs. Once you have your spark then worry about the fuel.

As you have probably figured out by now, you will have to treat it as a no start and troubleshoot it when it fails to start. Until you figure out if you are loosing spark or fuel to the injectors when the engine dies you have no direction to go in.

If its cranking and wont start it could be alot of things.
if its not cranking or just clicking your next check should be the starter

Has the timing belt ever been replaced?? Did this problem happen all at once or has it gradually, just gotten worse and what size motor does it have?

Check your gas for possible water. Just in case try a can of SEAFOAM in your gas. It will take about 10 min of running to work. Also recheck the gap on the spark plugs it should be .044 gap. One other thing to check is the firing order and make sure the wires were put back in the right place to the right spark plug

Did you replace the crank sensor that is bolted to the back of the module? Is it possible that you got two of the plug wires switched. Or maybe 1 of the two coils is bad.