1989 cbr600f stalling problem
 

So I took this bike for a trade and he doesn't know anything about the bike. So back in about late September early October I got the bike and rode it around the block a few times usually for about 30 minutes and the bike was fine ran perfect. Now when the first cold hit I had the bike in a garage (not heated) and it sat for about 2 1/2 weeks before I was able to get back out to where I had it stored to start it well I got it started and started to ride down the road and it started loosing power (it was like 20 degrees outside) and died completely out I tried to start it and it didn't do anything but kill the battery. So finally I replace the spark plugs and put a new battery and some injector cleaner through it and it ran fine for about a week. One day me and my buddie decided to go for a ride and while out I noticed the bike started reviving super high but not going anywhere as if it was in neutral and not long after that it died out again and wouldn't start. so I'm just curious as to what you guys think I have been told so many different things