1992 Corvette warm/hot start problem

My '92 won't start for a few minutes if the engine is hot/warm. Starter, so lenoid, battery all good. Replaced distributor, plugs, wires, coil, injecto
rs, fuel pump and fuel filter. Bought a fuel pressure regulator and that wi ll be next. When attempting to start, it sometimes will sort of cough like it doesn't have enough fuel. Holding gas pedal down for 30 seconds or so wi th key off sometimes helps, but it can take 10-20 minutes sometimes to get it to start. Any suggestions will be appreciated. Thanks.
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