You're welcome. And I apologize very sincerely if my original quick response led anyone astray.

 

mine does the same thing but it's not on cold start. If I run at operating temp then shut if off, say to fill up or run into the grocery store, and start it up, i get the thirty second to a minute rough idle then it goes away. I was told the o2 sensor needs to heat up but why doesn't it do it first thing in the morning? it should be hot still after the 5-10 min sit. and i had it hooked up to a machine and it is actually missing in 5 and 7 during that time then it goes away. I checked wires and routing. everything is new, including the motor. new ntk o2 sensors also.

 

When there is a misfire, the PCM starts counting and does not throwe a code until it reaches a certain vaulue - can't remember where I read that or what the count is. I suppose that this would make it really hard to determine what is causing misfire for brief period.......

 

mine does it every once in a while on a cold start. when i start it it goes between 1200-1500, than goes right to idle, but after a couple minutes you hear it start to idle a little weird for about 5 seconds, then clears up on its own, weird, but doesnt bother me to much

 

Oh mine bothers me. It drops to idle then immediately jumps up and down about 2-300 rpms for that short time frame. It rattles my exhaust like crazy. It's pretty bad.

 

holy....yea, mine doesnt jump like that, kinda sounds like mine starts firing oddly on the cyls

 

and smells like gas really badly after

 

I have 2 dodges doing this . Both will be idle fine then starts to drop and barely run and will stall if i dont give them gas. No dash lites. Both do it when they are at running temp.

 

My truck used to surge at cold idle and run rough when warm. Changed out the coil and it was fixed. Also cleaned out the TB and IAC for the heck of it.

I'd suggest cleaning the TB + IAC first, then testing the throttle position sensor and coil. Also check around the intake for vacuum leaks. If your exhaust smells like gas and your O2's haven't been replaced in a while those are likely culprits as well. I had this problem and new O2's (NGK sensors) fixed that.

 

I'm having a similar problem in cold weather in my 96. It starts but when I start to drive it then it will die regularly unless I keep my foot lightly on the gas pedal. After its been running a while then it has no issues. Is that the 02 sensor acting up and making it run lean or is it something else like an IAC problem?