A really strange thing keeps happening as i'm driving my truck. I will be driving and it will be smooth all of the sudden it bucks a little. I did check the transmission fluid it is full and bright red. Could this be my transmission slipping? Seems like it is getting worse. What i heard is it could be a vaccume leak or a idle air control sensor possibly the mass air flow sensor. It has been doing this for a while now but it seems as of lately it has been getting worse. No check engine light either i don't know what is going on very very confused at this point.