August 30, 2011this issue happen last winter when i would start the truck in the morning or when it was cold (30 degrees and below) the truck would start, then after a second or two when the high idle would start to drop ir would run real rough until the truck started to warm up then it would even out and run fine. I have been told that bad o2 sensors could cause this or something about the intake gasket leaking when cold.
Do either of these sound like the culprit? how would i test either theory to figure it out? if the intake gasket needs replaced is there a guide somewhere that i could follow. I am relativly mechanical but havnt done a lot of engine work so pictures would be great so i know what things are.