Subaru Impreza Engine Runs Rough

Car Starts Ok An Idles Fine, Drive A Few Miles To Get Warmed Up An Than It Runs Really Bad To The Point That It Will Stall At A Stop, Have...

My 93 Impreza Will Run With A Shake While Sitting In Drive, Put It In Park Or Nuteral And I Runs Smooth. It Dosent Hesitate When I Pull Off...