[bbudziszek]

there is a coolant temp. sensor that will cut an engine off if the temp. of the engine gets too high too quick and it wont allow it to start properly agian until it cools enough, if the sensor is faulty then it may act as an electrical problem rather then an mechanical problem. i would have that checked before trying the convertor. if not have the garage check you 'grounds' if you have a bad ground from the motor tothe battery then it would do the smae thing.
-bob