So a few days ago after getting off the freeway my transmission would not shift into 4th gear. I messed with the throttle a bit and it finally shifted. Than yesterday im driving on the freeway and slow down due to traffic and the car down shifts into 3rd and stays there. Again messing with the throttle sometimes makes it shift but not always. This happens only whens its hot. Ive tried adjusting the vacuum on the side but no success. Thought id see if any one had any ideas.