clutchkith

This is my firdt post. I recently bought a 92 corrado with 60k from the original owner. When I go to accelerate it barrely does but, if i feather it sometimes I can get to 4k, other times it falls on its face. somtimes when it it will backfire but rare. Im currently searching for related issues on the forum but have yet to find any. I heard mention of being able to possible read flash out codes but dont know how. any info where I should start diag would really help.