Engine wouldn't accelerate after pulling onto road and flooring it. Dash lit up. Pulled over and turned off engine, wouldn't restart at all, wouldn't really crank either (like a bad battery). At shop, verified battery OK. Took out spark plugs and engine would turn when key turned. Thus a compression issue, which was verified by removing front of engine and seeing the cams where not aligned all of a sudden. Clearly the chain slipped but was tight so don't know how that happened. So as of now, I the chains are removed and the cams turn find, the battery pump turns find, but the crankshaft is the weird part and where I need help/advise. Initially, the crank shaft would turn 359degrees and stop. if I really cranked on the 24" breaker bar, it would continue and turn again, until the exact same stop each time. If I turned the opposite direction, it would stop at the same point every time. BTW, the turning was not as "clean" as I have seen on other 4 cylinders but it did turn. OK, then the weird part, as Im turning it and expecting it to stop at the same spot again, it continued. I kept turning and it went around 5 or 6 times, went the opposite direction and it kept going. So all of a sudden, its turning with no issues. Nothing fell out, no weird sounds, it just turns now. So before I put the timing chain back on and reassemble, is their any advice to check/replace XY or Z? BTW, it is still not turning as smoothly/cleanly as I would expect of a 4 cylinder. its not grinding or anything rough, just tight, and remember its only the crankshaft that is turning since the timing belt and oil pump chains are off. Could it be in the transmission, like the torque converser? how could I check that?