Has anyone had Valve train issues with any Discos 1996-98 years. I just got news from the shop that I'm having some sort of problem with my exhaust valve and there telling me that I have to redo the top end. I took the truck in to have them check this ticking sound that was coming from the engine. I replaced the cats, gaskets for the manifold, have check out the hole exhaust system everything is solid, and the sound has now become non stop when accelerating at any speed. It sounds like a tin taping sound. I keep getting a code P1177 misfire. All the shop tells me is just get a new truck sell this thing and don't put the money into her. Can anyone give me advice on this issue. what do you think this should cost me to fix or should I find a new motor? or just get put the disco up for sale. Thanks for all your time into helping me.