I have a 1999 dodge ram 1500. The automatic transmission shifts fine when I give it a little gas,but when I stomp on it it tries to shift in lower gear. It doesn't slip at all. Also when I have my ac on it goes from vent to defrost. all of this started after i degreased my moter. Would these 2 things have anything to do with each other,and if so what could it be? Already tried changing the filter and the throttle control sensor,didn't help at all.