2013 Nissan Frontier Engine Problems

This is an intermittent problem sometimes this problem will happen as far apart as a month, Then for two days then go away. When accelerating the truck will starting bucking, not getting to enough fuel, this will sometimes not stop the next day I take it to the mechanic it is running fine no check engine light comes on. He runs a diagnostic, no error readings this has been going on for 6mos.. Once it was so bad by the time I got it home it had fried the converters. The mechanic changed the converters replaced all the censors on the engine and converters clean the injectors, replaced the plugs, and changed fuel filter, tested the fuel pump, good. I need help, don't know what to do. Had another shop run a diagnostic check after all of this could find no problems, but the problem is still there. Afraid of stalling in an intersection and getting killed.

MANIFOLDS BREAK APART 2 TIMES SINCE OWNING THE TRUCK

TL* THE CONTACT OWNS A 2013 NISSAN FRONTIER. WHILE DRIVING APPROXIMATELY 60 MPH, THE VEHICLE OVERHEATED AND ANTIFREEZE SPILLED FROM THE ENGINE. THE VEHICLE WAS TAKEN TO THE DEALER, BUT WAS NOT DIAGNOSED OR REPAIRED. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE. THE FAILURE MILEAGE WAS 21,000.

TL* THE CONTACT OWNS A 2013 NISSAN FRONTIER. WHILE DRIVING APPROXIMATELY 30 MPH AND APPROACHING A STOP, THERE WAS AN ABNORMAL SOUND FROM THE FRONT OF THE VEHICLE. THE CONTACT ALSO SMELLED EXHAUST FUMES INSIDE THE VEHICLE. THE VEHICLE WAS TAKEN TO A DEALER FOR DIAGNOSTIC TESTING. THE MECHANIC STATED THAT THE INTAKE MANIFOLD ON THE DRIVER SIDE WAS FRACTURED AND NEEDED TO BE REPLACED. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE APPROXIMATE FAILURE MILEAGE WAS 37,700.