everytime my girl starts her car to warm it up, the car start to shake a little bit. if ur inside the car u can feel it shake. i look under the hood and found there was no belt. what i was told that the missing belt was to the power stearing and ac. me and my friend change the oil and oil filter to make sure if it was the oil. it was'nt the oil so we put a new belt on that was missing. after we put the belt on the car, the car begins to shake really bad!!!!! we tighten and lossen the belt. it was still the same. i dont know what it could be.

need help asap!!!!!!!!!!!!!!

does it gives u a check engine light on your dash?the reason i ask is because if you do have the light on it could be a faulty sensor,i been having my paseo for over 7 years and the only time my car shook badly was when my valves bent in my engine.