When I start the engine cold, at first it revs up and then dies. I have to try to start the engine several times until it finally runs very roughly for a few minutes. If I depress the accelerator peddle when the engine is running roughly, that always makes the engine die, and if it doesn't die, the engine rev's up momentarily when the peddle is released. After a few minutes of very rough idling, the engine runs fine. My mechanic chenged the flow meter, and that didn't make any difference. He said he changed the head temperature sensor when he changed the timing belt about two or three years ago, and in his opinion, the temperature sensors don't go out that often. When he puts the engine on the computer, he says that doesn't tell him anything. He seems to be a good mechanic who has always diagnosed problems corectly in the past, but he can't figure this problem out. Actually, mine is an '84 zx, but I think the engine is the same. It's a turbo.