Dist timing question

[s13EastTN]

Ok, I'm not that new too cars, but I am too nissans for the most part. I looked at my distributor the other day, and noticed that it looked well....improperly timed. IE you know how you can advance or retard your ignition buy turning one of the screws that holds the dist on, and then moving it to the right for advance (guess) and left for retard, well mine looks like it's fully advanced. IE it's all the way to the right.



notice the bolt right below the valve cover? thats all the way to the right on my engine. Now I've been using 91 octane and haven't heard any detonation or anything like that, but I figured thats just because the ecu retards the timing. It sometimes dies or wants to die when i'm driving through a drive through or pulling into a parking lot at low speed, think this could be the cause? would there be ANY reason what-so-ever that this is fully advanced/retarded, and should I move it towards the middle?

[s13EastTN]

Well I adjusted the dist to the same exact as in the picture, and I get detonation. Any ideas?