Thanks Glenn, I have tried to set, reset and adjust the timing from the large screw on the rear pivot arm with negative results.
I have also tried the clutch button, but never in reverse. I’ll try that tonight. It didn’t stop sewing when it jammed, I just noticed that it wouldn’t feed, then upon inspection found that the presser foot was lifting 2 distinctly different times; when it should and also with the walking foot. When it lifts with the walking foot, it doesn’t seem to lift as high. I know it can’t be anything too crazy as these machines are simple but precise.
Update, problem resolved. After more staring at my machine, I realized that my walking foot height had changed. After resetting it and then recalibrating all of the timings, I am back to sewing normal. Thanks to the help from the group. Happy sewing!