node (page not found problem)

Hi every one,
I am having issue to view some nodes when these nids already exists in database..
When i search some results to view nodes it shows me the result on car dealers with nid =2178 but when i click on this node to view it shows me page not found error and when i check this 2178 nid in node table it is exists and also exists in node_revision table ........I am not understanding why this is happening and how can i solve this issue ....
please any one can tell me how can i solve this issue .... it s very urgent for me ..

Thanks in Advance,