My jeep did not make this puttering noise until after a trip on the trails last Saturday.
Will not putter at idle even when revving the engine.
Only putters when moving and sounds worse in a higher gear going up hill (with load on the engine).
It sounds like either a bad lifter or an exhaust leak.
I did notice that the front exhaust pipe to the flange has some space between the pipe and the manifold, but those bolts are so rusty I can't imagine it backed off and caused this.
Is there a way to diagnose certain loud ticking noises such as lifter noise, etc?