Firstclasswhitetrash

Okay...well I went on a club run 2 months ago and parked my rig for 3weeks then went to start it to put new shocks on and it wouldn't start, after replacing multiple things I took it to a mechanic that owed me a favor and the problem ended up being 10 gal of water in fuel tank, he flushed it and put a anti freeze additive in it and it runs now! Only problem is that every first start up is a long multiple attempt process, it cranks fine then faster and faster then finally after 3/4 attempts slowly fires up and runs fine... After initial start up it fires right up every time, any knowledge of what would cause this?