Micra K10: Engine running restless, limp power 🙁

Hello your hobbyist and screwdriver, in December I had described my problem of non-starting. Thanks to a local forum member we were able to locate the error. Timing belts were torn. However, I was lucky in the accident. The belt is immediately torn when starting. Ok, we have now installed a timing belt and motor is running too. But now the following: it seems that the engine runs only on max. three cylinders. I changed spark plugs for safety. However, no Bes When I drive up a small mountain, the power drops immediately and I crawl through the area as a driving obstacle. Also the car rattles quite neatly. My question: how can I check which cylinder is ok? Can I, for example, pull off two ignition cables and start the engine? Already a thousand thanks for every hint :-))