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Iam having an intermittent problem with my 2000 Mazda 626 that is driving me crazy. The problem happens after the car is warm. If I turn off the car for a minute or longer (afterthe engine is warm) it will start and then die immediately (the idle will be very rough, before it finally cuts out). This problem can occur when I drive my car short or longer distances.

Sometimeswhen I finally get my car started a puff of black smoke comes out of the tail pipe.

I have had my car towed to my mechanic's shop twice when my car has failed to start (after driving it for a short period of time).The first time, my mechanic was able to startmy Mazdaafter it for an hour or longer.

My mechanic has tried to pull the codes on my mazda, but has been unsuccessful, since there are no codes and the car shows all systems okay.

I need help in solving this problem??? Any advice would be appreciated???