I recently bought this mazda (ranger) 4x4 3.0 ltr w/94k with a engine miss. turns out there is very little to no compression just in that cylinder. engine was compression tested and also performed a air leak test with no leaking at all . pull the valve cover off and all valves rods are moving like they should. We next took the plenum off to check for air restriction and it looked ok. also the engine does not smoke and make any noises. We are at a stand still right now. We talked to someone and they said possibly valve timing off. anyone have any suggestions?