P0630 KIA - bought a car with this code, maybe is the engine in this car not the original

Question

My daughter's car is losing power. I got the codes which were P0630, P0130, P0113, P0036, P0170, P0030. It runs pretty good but is a rebuild after an accident. I wonder if the engine is not the original as it was sold to us with the seller saying there is only 85,000 kms on the engine which makes me suspicious. Today when driving the vehicle it often loses power and is unresponsive to the gas pedal.