[Roket]

My 92 mustang will idle at 2000 then goes down to 1100 (modified motor) like it should..then while im sitting still in neutral, it will slowly climb to 2000 again, and then goes back down to 1100..then after a while (few seconds), it goes down to like 800...ihave the idle set right and the tps....what can be causing this...oh..also have new o2 sensors installed today. Thanks guys