Engine Mechanical problem
2002 Dodge Dakota V8 Four Wheel Drive Automatic 106000 miles

I recently purchased this truck from a dealer. After about two weeks it started to knock or tick. I took it back they looked at it and replaced the timing belt tensioners at no charge and the noise still remains they told me they could replaced the timing belt with no guaranty for $1100. If you listen with stytscope on the valve covers you can hear it, but if you place it on the fuel rail it is really loud. do you have any ideas? thanks