The War Wagon had a miss so I started checking it out. I pulled the plug wires one at a time and found that three cylinders were dead, made no difference in RPM's at all when the wire was pulled or all three at the same time for that matter. I pulled the plugs and checked to see if they were firing by laying them on the engine and turning over the engine and they were. Pulled valve cover and found the valves working OK. Did a compression test and found all cylinders down in the 60 to 70 PSI range, use to be 125 to 130 PSI before. I put some oil into the cylinders and the pressure only went up 10 PSI per cylinder. Hard to believe that all the valves are bad at once but who knows. The engine will start right up and smooths out when warm. The engine will hold 17" of steady vacuum at warm idle. Now where do I look next?
Thanks for any input,
Jim