Toyota Corolla distributor problems etc.

Hey how are you, I have been through so much frustration with this car since March of this year. Its a 1991 Toyota Corolla, 1.6L engine, 107,000+ miles. In march it wouldnt turn over one night and one mechanic told me I needed a new distributor. I purchsed a used one and the car cranked fine, however it jerked when I put the car in drive or reverse for about 5 seconds then began to drive fine. The check engine light would come on randomly then go off. The car engine would also stall and stop every time I came to a stop. After this I took the car to castrol car care center and they ran a diagnostic and found that I had a code 14 igniter problem/possible ECM. The guy told me to buy a new distributor and I did, but once I got that one put in, the car still is driving sluggish. What could be the problem? Because nobody can seem to give me a solid answer or figure it out.