I have a po 135,141,155,161 trouble codes all are heater codes what is this

Question

I have a 1997 ford explorer with sohc 4.0 engine with these trouble codes po 135,141,155,161.It is acting funny=it wont idle correctly when its cold.when i first start it ,it goes about 2500 rpm then it falls down till 600-700 rpm then it goes back to higher rpms and it will to this till it warms up. got any ideas?