I have a 97 Explorer Sport with 4.0 SOHC. What happens is when it's cold out usually below 30 degrees it'll start fine then they rpms drop way down and she'll sputter then rev then sputter. It'll do that for 30 or 40 seconds then idle normal. Had it at the garage and it shows no error codes. The check engine lite ie not lite. They suggested replacing the coolant temp. sensor which was done. No difference. Also replaced the intake air temp. sensor. It's still didn't help. Does anyone have any idea what may be doing this? Any help would be appreciated.
Thanks