Stretched chain symptoms

Hello guys ...my engine is sluggish on cold starts I can hear the chain when the engine is cool after its hot It will be quiet .. Though I am experiencing very poor mpg... .are these symptoms chain related... Cleaned the whole throttle body... No change..... The engine doesn't have themo stat .. Can be the cause?

Sent from my Redmi 4X using Micra Sports Club mobile app
 
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