peugeot 106 bj 6/96 34ps first bought, has some problems, please help

Hello guys I bought a Peugeot 106 yesterday as a winter car with 45 ps 5.gang (s2). Car drives as far as I know clean ( know zero from ). I think however that he has some problems. 1. Does he really have so little power??? There is hardly anything !!! 2. It starts, but only after about 3-4 seconds. 3. The previous owner said he needs an inspection What should I change everything until he is fresh again? Which oil for example 4.if I go away from the gas then it takes a little until he stops rt. So he’s still in the ga phase when I walk away from the gas. For a few tips I would be grateful Ps: the ZKD I think a little leaky. Around the engine block he sweats a little and there was not enough oil in the car, then I had to refill. After the water I haven’t looked yet