91 Crx Si Zc Turbo Problemzz

i go0t this 91 honda crx si with a zc motor and its turbo...its a small garret trubo with about 2 inch piping and msd...and i have a couple of problems tht just appeared... i have idling problems...the rpm doesnt stay still it keeps going up and down...and also0 when im driving for some reason sometimes it doesnt let me go0 past 5000 rpm..it strts stuttering and popping...idk wat the problem is but is drivin me crazy...please help..thnksss