Nissan Mirca K11 – Control chain

Hello, find urgent advice … With my Nissan (automatic) the control chain – because of extreme noises – was changed by our forest and meadow-mechanic (should probably be a usual problem of this brand and for that there is already the corresponding package to reorder) So, the noise is gone … ONLY unfortunately the car does not pull anymore ( … so I sometimes do not come from the place anymore, very slowly and at the end there ́s ́n Ruck and the W agen shoots before … (very used to). I gave the car again for inspection, but he doesn’t find the problem. Now an acquaintance has thrown me the catchphrase “tax time” … Can have something to do with it. Would I be happy about answers … Ansa