Well, recently i have discovered that when i have three low-poly car mods (GTA V cars) i get the taxi bug, but not when i am using 3 low-poly and 2 high-poly mods. Weird? I think it very strange.

I think it's completely normal for car mods to make GTA IV act out of the ordinary, some might cause bugs, some might not. Just because they are high-poly won't mean they will cause the taxi bug. It increases the possibility for it to appear though. The taxi bug is caused by GTA IV running out of video memory, which can be caused even without mods at all. 

Ah, i see. But i think it's weird because... It should be the opposite. 

I don't think you read my reply properly.

 

Some mods cause the taxibug, some don't. In this case, they don't apparently.  

Ah, now i see. Another weird thing is when i only use two of the cars that have worked before w/ out the bug make my game get the bug. I'll have to use vanilla then. Sigh.

Awesome! The vanilla cars are the best as you know :) No SMPA60 or CTDs with them. 

Yeah... Except the GTA V stainer looks so much cooler... 

F*** it. Now i get the bug with an unmodded copy... :(