ok so here is the new problem im having on my 3.1 at a dead cold morning start up after you start the car it idles at 1000 to warm up as it sits idling at 1000 the car drops down then back up best way to say it sounds like it has a cam also im getting really badd gas milage 200 to a full tank i figured maybe a o2 but i put one in an no luck so now im thinking could it be a bad ecm!??????????thanks Mike