Missing out when cold

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i own a 1998 blazer 2wd v6 vortec sometimes it is hard to start after sitting a couple of days sometime even in a shorter period of time. it misses out when cold and gets very bad gas milage but when it warms up it runs fine but the gas milage is still terrible. i replaced the fuel pump and the spark plug and wires along with the distibutor cap and button.