when you start to get taxi bugs, missing textures, ped bugs, or any time of texture or actor/object loading bug it's because the game is running out of memory and is trying to compensate for the loss of memory by the mods. the rage engine is neat in that since the engine doesn't understand where the extra memory weight is coming from (i.e. car packs and enbs) it compensates and tries to continue on and make the game playable by shortening the amount of actors and objects it needs to load and process. the best remedy is to buy a graphics card that has 2GB or 3GB of dedicated memory so you can use up 1GB for all the bells and whistles of the game in it's vanilla form, and then use the rest of the memory for car packs and enb effects. you might have memory left over to, you know, run background stuff on your desktop.