Code 11 but the car still runs?

[[HTi]Johnson]

Hello. My car is acting funny...stuttering until about 1.5k RPM and then just taking off fine. When I push the clutch in or just let off the gas without being in gear, it'll die...but start right back up. I think my alternator maybe taking a dump, could that affect it? This is a 1987 Gl-10 Turbo with an Intercooler.

 

Oh yeah, I adjusted the timing, it was at 25' BTDC. Must've changed when I put the new belts on. It's at 20' now.