so I recently bought a 94 dodge dakota 5.2 auto 4x4. The truck supposedly drove into the barn it was sitting in 5 years ago. The truck has 94000 original miles. The starter wouldn't turn the engine so I pulled the spark plugs and turned it with a breaker bar on the harmonic balancer. The engine will turn one full rotation in either direction before it stops. No movement past a full rotation of the balancer. I pulled the valve covers and all rockers are tight. Oil was old but clean(no glitter or metal). This has me stumped. Any advice for what to look for would be appreciated.