wbthornton88

My engine has been running sluggish for a while now. First I check the codes and I was getting code 52 and a code for running lean I believe. When I cranked the truck before replacing the knock sensor, the engine would have decent power for about 10 seconds after every start and then bog down until It was turned off and recranked. After replacing the knock sensor I can't get the idle above 500 and the engine feels as if it is always bogged, I get no more acceleration if the gas is pushed down a little or alot. Especialy at about 40 mph in 4th or 30 mph in 3rd. I rechecked the codes and I'm only getting code 21 for o2 sensor. Would this be making the truck idle lower than before? I don't remember having code 21 before but the red wire on my o2 sensor cable was broke so it was most likely like that when I was idling at 1000. Seems I can't get the truck to idle between 500 - 650 and 1200.