I have looked at three trucks last week to buy and they all have a dead number 5 cylinder Why number five? These are all 89-95 toyota 4x4 5-speed trucks with the 3.0 v6, Pull the plug wire and nothing, my boss says rocker arms, but would only the same one go bad on all the engines? I cant take the valve cover off on a test drive since the intake has to come off to remove it. Cant find a boroscope to look into the cylinder while someone cranks it to see if the valves are not moving or if a piston is bad. I really want the last truck I looked at but dont want to spend 3,000 on a truck that needs a 1,500 dollar engine, it just doesnt make any sense. please let the magic of the pbb toyota gurus help me out.