Will not start on first try in the morning

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The engine will not start on the first crank in the morning. It usually takes a second or third try. After that it has no problems during the day even if it sits for hours before another start. I have turned the key to the on/run position for a few seconds to turn on the fuel pump and it still does the same thing. I have done this several times in a row before trying to start the engine and it still requires at least one crank before startiing on the second time. I have replaced the plugs, rotor and distributor cap and idle control valve, cleaned throttle body too.