Sticking chain/jockey wheel/something

Ajoten

Old School Hero
At a couple of points in its rotation my chain is sticking a bit. If pedalling forward it's just stiff for a few links, if backward at the same point the rear mech gets pulled forward and the chain usually comes off.

I replaced the chain but it didn't make any difference. My next port of call is to replace the jockey wheels, which are worn but not scarily so (and I don't know if they would cause that symptom anyway)... but foresee getting it all wrong again and throwing more money away.

Any ideas would be gratefully received!
 
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