I have a 2000 xterra 3.3 and recently replaced my knock and ckp sensor. I got it all back together and went to set the timing. While in the adjustment mode it reads 15 degrees BTDC (3rd notch from left) and idles at 725 rpm. I shut it off, reconnect everything and fire it up. Now the timing reads 30+ degrees BTDC and idles high about 1500 rpm. Could one of the sensors I installed be causing the high idle and timing? Do you have to sync the ckp sensor with the ecm? No check engine light, actually runs really good now aside from the high timing and idle. I appreciate your help.