95 Eclipse gs (nonturbo)intermittent no start

Hi I just picked up a 95 eclipse gs, and on occasion I get good crank but no start. If I hit it with starting fluid it'll turn over, then runs like a champ! Every once in a while it'll die on the highway but not on a regular. There's no rhyme or reason to the no start. Sometimes it fires right up, warm or cold out, other times I gotta shoot some starter fluid. Once it's running it runs great. I did notice a slight fluctuation in rpms (dips a lil) at an idle but nothing that really stood out!! Anyone have any ideas!?