If you update your profile with more details about your car (engine size, spec) we will be better able to help, as some things are different between 4 pot and V6.
When you say you had trouble with tickover and you adjusted it, what exactly did you adjust?
Tensioners and idlers make sure any slack is taken up on the belt so it doesn't slip. These are often the first things to cause cam belt failure even if the belt itself is in good condition. Over time the belt stretches slightly and the tensioner is required to keep the right tension throughout its use. The idlers are used to make sure the timing is correct on the cams. Sloppy mechanics will sometimes only change the belt but leave the original tensioner and idlers, which is asking for trouble.
V6 engines use the aux belt for the water pump, 4 pots drive the pump with the cam belt.