transmission

i have a 92 sl1 5spd manual and when i am driving and take my foot off the gas it hicupps and shudders a bit and then if i barely touch the gas it shudders a lot. to make it stop i just push the gas more and its done but this makes it very bumpy to try and maintain a certain speed for example

25mph is very hard becuase u have to push the gas enough to make it go but not speed up and that makes my car shudder