2004 Chevrolet Silverado 2500 fuel system problems

Tl* the contact owns a 2004 chevrolet silverado 2500 hd. While driving he saw smoke coming from the tail pipe, and then he smelled a burning odor. The vehicle was taken to the dealer for inspection. The technician concluded that the thermostats are not allowing the vehicle to achieve operating temperature and injectors 5, 6, 1 are defective. The repair will be performed at the owners expense. The failure mileage was 102000. The current mileage was 103000.

Check engine light came on and "low engine power" flashed where the odometer is. This caused the rpm's not to go over 2800. Code reader claims o2 sensors or throttle control module or catalytic convertor issues. We discovered it was none of the above. To fix problem change 3 relays located under hood in fuse box. Relay #8864. Then clear codes, should fix issue unless code persists. Relays will cause a fire if not changed out asap.