A few things:
1.) Petcock vacuum source. If the vacuum source is compensated, the petcock doesn't open all the way, and the engine will starve for fuel at speed. The includes the petcock vacuum line, and the internal diaphram itself in the petcock. I believe 1998 was pre-Ethanol rubber.......... they can deteriorate with age. Ethanol can speed that up.
2.) Clogged crossover line. (if applicable) Is the left side of the tank running out, and not being resotored fast enough by the right side of the tank? Have you looked in the tank when it shut down, or does it happen at 1/2 full or less, and not at full?
3.) Clogged or partially blocked internal petcock filter.
4.) Crimped or compensated fuel line. Again.....pre-Ethanol.
5.) Fuel tank not venting enough, including blocked vent line, incorrect or faulty vent on cap. (You can suck on the vent in the cap and it'll "pop" and open. You can't blow through it.)
See if that helps.
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