The car starts, but revs drop to 500 or so. Of course, the engine starts shaking. After a few seconds revs slowly klimb to usual 800-900. This happens only on a hot engine. Usualy after a long drive. Today revs dropped to 0 and it stalled for the first time. Had to give a bit of throtle and it ran o.k. Checked the codes and came back empty. Everything seems fine. Any ideas where to look? Btw, i did the search here.