gremlins in my blazer...

Iv got a 99 2dr blazer 4.3 vortec auto 4x4, she runs amazing. Doesn't spit sputter or bog down. But damnn she is sper hard to start. Once warmed up she'll start right up fine. But normally with a cold start I have to hit it with starting fuild. But once it starts runs flawless and will start back up. I put a new gas cap on, plugs,wires, cap, fuel filter..basically gave her a good tune up thinkin it was just old plugs or wires. Haven't tested fuel pump but wats weird is the pump doesn't prime until after I turn key off then I hear it kick on for 10 seconds or so. It kicks on when I try to start it. But when I just turn the key one notch it doesn't come on. I really don't think its a fuel pump issue due to how great it drives. 80mph down the high way with no issues... sooo why in the h+ll is my blazer soooo hard to get started? Fuel pressure reg? Temp sensor? Crank sensor? I'm stumped...what r y'all thinkin?