Outer Limits 4x4 Board

I have a 2.5tdi i started it up for the first time in about a month and it was fine after takeing it for about 10 min drive i stoped for 30 mins or so and now below an idle it vibrates very very badly.. Why could it be doing this?? i put new oil in before i started and has new clutch and new oils in gearbox and transfer..

May be a bad injector or filter or your counterbalance shaft belt broke.

My belt broke early & went under the camsaft belt.

Broke 4 lifters.
Lucky as it didn't bend the valves.

or if the clutch is new maybe it is loose????