I'm back for my weekly problem w/ my Ram. 2 weeks ago, it developed a rough idle and horrible surging in overdrive. Had a burned plug wire, which I replaced along with the plug and all was well until yesterday. I also installed my freeze plug block heater at that time. Worked perfectly until this. The wife went to leave work with it yesterday, and it started to idle very roughly and make a sucking noise through the intake, along with some sort of rattling noise (which MAY have been the muffler which needs replaced.) A friend towed it home since I was out of town and said the CEL was coming on while they were towing it. I got home, charged that battery, and started it. It made the sucking noise through the intake while idling rough and died. Now it won't restart. No codes. I unhooked the battery to reset the comp and see if that helped, and it will crank but not fire. This is the first cold day we have had. It is pushing zero and I can't get it into the garage, so I am looking at having it towed and worked on, but I'm looking for a place to start. I was unable to get the rear o2 sensor out and changed while I was working on it 2 weeks ago, and I suspect that is bad. It has also had an ongoing problem of developing a rough idle shortly after being started cold. The engine will start to lope and it will start to suck air through the IAC passage. i know this because I have pulled the air box and stuck my finger in front of the IAC and can feel the air rushing. Could either of these, combined with the cold contribute to this?