I am having a issue with syncing my Iphone 4 IOS 4.3.2 with itunes it seems it removes some Apps that I got from installous namely all my Angry birds Apps ? anybody know any fix to this or am I doing something wrong?

Easy fix, don't pirate software. The game you mentioned is a whopping $1.99. If you can afford a $400 phone, you can afford a $2 app. Read the rules before you post, we do not support pirates and any further discussion of stealing software from legitimate developers will earn you a ban.