I bought a wool hat. (To heat my head)

Hello everyone, I have a problem with a 97 gas traffic. Their gas is

nr1
black smoke by stepping on the accelerator, moderating gray smoke
2 exesive oil. The truck starts with a single touch of heater in winter, summer, cold, or hot.
The noise is a repiqueteo appears suddenly and is suddenly releasing the accelerator, then it is more frequent. Just noise appears but without more symptoms.
It works at its normal temperature, it sounds even without any noise except that one that appears. The oil light turns off when lighting it and does not turn on anymore. But I notice it average without force as an apanpada more on the road. Thank you. Seeing if any lamp is turned on.