One the chain sheared, link type not roller type, my theory... chunk of plastic (i found many pieces ) from the guide got between teeth and chain. Chain couldn't crush it so chain sheared.
Two, guide came apart and chain skipped a few teeth.
Three, nylon teeth on cast cam gear, 160000 miles nylon cracked away and chain skipped a few teeth ( anyone want to guess what engine that was? Hint not mopar)
