GTA 4 Stuttering/Lag problem

I bought GTA 4 via Steam and I've noticed that about 45 mins to an hour in, the game randomly starts stuttering. I figured it was probably because the settings were high so I turned them down and it still stutters. I turned V-Sync off and it helped a bit, but the stuttering still happens. I'm not sure what the problem is and from what I've heard it's a fairly common problem on PC. Is there any fix?

CPU - Intel i5 3570k 3.4ghz
GPU - Gigabyte GTX 660 OC'd
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More about gta stuttering lag problem
  1. GTA IV was poorly coded for the PC and has a large array of problems on all types of hardware.
  2. Have you tried running contig.exe [it's a Microsoft tool] and defragging your game directory? You can Google it for a full tutorial....Not saying that it will positively help,but it did boost the game's performance in my case. Hope this helps. :)
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