i have 1995 18 donzi classic power trim is acting up
outdrive goes down fine but going up will move very slow and pump is spinning, oil is full what should i look for

screen on valve body; also check pressure on manifold presets (dealer)

Check your trim cylinders for scoring on the rams. End seals will cause problems for triming up or down and like jhiguy377 says check trim pump as well and looking for signs of water