my car seems to tug a bit sometimes when I am driving on the freeway. I just recently put on a blox intake manifold and a 70mm throttlebody. I noticed that all of a sudden it will tug a couple of times, anybody have a idea what it might be ???

 

just a chance, but one thing that nobody takes into consideration is that any upgrade ultimatly effects air fuel ratio and if you are getting to much air than you might need a tune to better get air fuel right. but that is just a possibillity.