Thanks for the info. Late December, I bought a 2003 with 49K miles, in great shape. I have changed diff fluids, xfer case and auto trans fluids. Everything seems great,except on cold mornings on startup idle jumps over 2k Reading on here I will try cleaning IAC and see if it helps. Also got engine light yesterday and had p0135 and 0155. Says 02 sensors. I reset, will see if it comes back.