rough idle after oil change on 3.0 V6 95 4runner. oil level is just above the line. pressure is holding fine. But on a cold start or warm. the idle is sputtering and gets real low when put in gear. will act normal as soon as I get it on the road for a while. but if it gets an hour to cool down, same thing again. What the hell is going on, was fine before I changed oil?