[Binx]

Sounds like a mouse problem. I'd suggest squirting the 50/50 acetone/trans fluid into the cylinders then use a hyd jack to lightly lift a breaker bar with socket to the pulley for a few days. If the exhaust, intake, road draft, or fuel pump mounts are open, mice may have found their way in. If the jack/breaker bar method doesn't work, you may have a mouse nest in the lifter valley jamming up the lifters with pee rust.

Lonnie