shudder on acceleration but goes away after up to speed on 2001 Subaru Legacy

Car has 2.5 liter I get a shudder when accelerating but smooths out after reaching cruising speed but, if I accelerate at anytime it comes back.No codes come up and tune up has been done.Car has 85000 miles on it. Never had any problems on it before.

Asked by for the 2001 Subaru Legacy