what makes the car tac drop when driving down road .. some times it dies

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car dies as drivin down highway have done so much work to it over 1000.00 .. have changed ignition coil,ignition module,cap rotor fuel filter fuel pump starter battery catalac converter .. just bought ignition switch still have to put that in .. An my ignition nkey an steering column heats up the key is hot to touch ... i need a obd 1 an no one has that computer for my car