The contact owns a 2017 Chevrolet Silverado 1500. The contact stated that while driving 30 MPH, the vehicle failed to accelerate as intended while depressing the accelerator pedal. The contact stated that the vehicle stalled. The contact was able to coast to the side of the road. There were several unknown warning lights illuminated. The vehicle was towed to the residence. The contact had the vehicle diagnosed by a mobile mechanic. The mobile mechanic diagnosed the vehicle and determined that there was a misfire in cylinders #3 and #7. The vehicle was not repaired. The contact towed the vehicle to B2B Fleet Services where it was diagnosed and determined that the head caskets had failed and needed to be replaced. The contact stated that the lifters were replaced; however, the failure persisted. The manufacturer was not notified of the failure. The failure mileage was approximately 65,000.