I'm having problem with my 97 Maxima. It might be running fine but at any moment it will loose power and then the engine will die. It is happening specially at low speed. The engine will start againfew minutes later and run fine for a while.A black smoke is coming out from the exhaust pipe. We have run several diagnostic tests and no code is coming out of it!!! We have taken the car to 4 different "mecahnics" and none have come with an answer. The car has about 60k miles and well kept. We changed the fuel and air filter, and also the spark plugs. Any suggestions???

 

Injectors...