Originally Posted by
foama
There are plenty of reputed belt manufacturers, and they all make good belts!
The Mirage belt is properly designed, has ample reserves, and has a simple and excellent tensioner.
If you really do want to do it yourself, you may want to look at the following thread:
Belt Tension, Howto
It tells you how to get the tension exactly to factory specification, and shows you how to check the exact tension. You want that tension to be exactly right!
According to your description, there is probably something else wrong that even the most inexperienced mechanic could identify in minutes! For crying out loud, go to some other place!