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2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
Along the lines of checking spark, it sounds like you could have an electrical issue where something heats up and creates more resistance. Did you try swapping the ASD relay and/or fuel pump relay ? The A/C relay should fit.