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Check the wiring for both systems from start to finish. You probably have a loose connection somewhere, that's often the problem.
Gasoline is generally viewed in regards to its octane value. In reality, there is very little octane in gasoline. There is actually a great deal of hexane. Additives vary, but are generally other organic compounds of the cyclic variety, benzene and toluene among them. It's a massive mixture of hundreds, if not thousands of chemicals which are blended for performance, pollution control, etc.
you may have some bad connections somewhere and when the truck moves it sometimes has a good connection then moves out of place again.
