One symptom of the oil pressure switch providing FP power is a long crank to start, because the engine has to build oil pressure to power the pump. Another symptom might be what you are explaining. At hot idle the oil pressure might be dropping just enough to open/close the contracts powering the pump. If this confirms what is wrong, your engine might have really low oil pressure at idle, or hopefully the oil pressure switch is failing too since I think it only takes 4-7 psi to power the pump.
If it's still there, there's a plastic cover on the pass firewall (above valve cover). Under the cover is the fuel pump relay. There is also a single wire connector right at the fuel pump relay harness that you can supply 12v for fuel pump testing, I think the wire is red. That bus bar to the left of the relay is a good power source for a jumper wire.
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