Bought this vehicle and it ran fine. Changed oil and started it to drive out of the shop and it seemed like it was missing. Then I notice the engine light was on and smoke started coming out the tail pipe. Checked codes. P0206, #6 injector. Replaced injector and vehicle wouldn't start. Lights came on the dash and had electric power. Pulled the key out and headlights and dashlights began flashing. Plugged in code reader and light. went out and vehicle started. Only ran for a while and quit and now won't start. No codes now. Any ideas? Is there a computer reset? Thanks.

 

The plugs maybe fouled by now.You may need to remove them and inspect.