i have a 97 power stroke that has a horrible knock from driver side of the engine it started when i was slowing down for a stop light. i immediatly pulled off the side of the road and shut it off. and had it towed to my house. where i hooked up my snap on brick to it and checked for any codes in the computer, found no codes, a buddy told me it could be and injector failure. i removed the injectors on the driver side and took them to a specialty shop were they test the injectors and said i had one bad injector, replaced cylinder number 2 injector, sucked all the oil out of every hole and put new o rings on every injector nowthe truck only starts when i hold the gas to the floor and it only runs for about 15 minutes and then it cuts out like someone shuts off the key, and the knock is still there, and i still have no codes in the system. any one run into this problem?