Slasher, never quite thought of you as doing things with graphics and MS Simulator! More used to seeing your articulation elsewhere, competing with other well known buffs!
However, I think you will find that your puter is a bit short of a couple of little known patches. Do I assume that you have FS2K? If so you will need to download a 8.8mb patch from MS to correct the stuttering. Go to MS/Games/FS200 and download your particular one PRO or Standard. One does NOT work with the other (if you will pardon the expression).
You can download a programme called Cacheman that will adjust your Vcache files and this helps a lot. Got too much for you? E-mail me and I'll help you out. Might be your graphics card if it's FS2K so a few possibilities. All solveable is the best news.