My Nissan Sentra shakes while sitting at red lights or coming to a stop sign. I have not fix the problem yet, because every time I have taken to the Nissan dealer or any local dealers around the area they cannot detect any specific problems. The mechanics tell me that without an engine light on it could be numerous things. So, they only tell me to wait until the engine light comes on. My car has been doing this for almost two years now. However, after reading all the Nissan Altima complaints in this site, I am determine to purchase the part (manifold gasket) and have a local mechanic fix this problem.