1990 Mazda Protege/323

well i bought myself the above said car and its pretty sweet. it has a 135 thousand miles and runs pretty good from 0 to 30 and from 50 on up to max which i havent found yet. i went and got the alignment check and the wheels balanced but the car shakes pretty good when i get up to 70, does anyone elses do that? also the 30 to 50 mph range is kinda slow to get to and going up hills is a little bit of a task for it, anyone else have this problem? well thats my rant hopefully someone can relate with me.