Codes should be there for governor pressure solenoid and transducer, since
thats what this sounds like. However, in the 98's, you couldn't get codes by
simply operating the key, you have to use a scanner.
I suggest you scan it at the time the problem happens, and see if it shows a
code. Regardless, I think a thorough check of the governor solenoid and
trasnducer are in order, as this is a fairly common problem in these trucks.
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