its got the inline 6 in it, sometimes when i give it gas it acts like it heasitates (not all the time) and when it does it if you hammer on it it quits doing it, sometimes when going to a stop or ideling the rpms drop down to like 300, but it wont die.. not throwing any codes either

 

First and foremost, check fuel pressure at the fuel rail using a fuel pressure gauge

 

and i forgot to add, it quits doing it after like 45 mins of driving

 

Did it just start doing it? Did it give any warning signs? Have you done any work to it recently? When was the last time you gave it a full tune up?
Like 1996sportXJ said "check fuel pressure at the fuel rail using a fuel pressure gauge".

 

its been doing it for a while, new plugs wires cap and rotor, the rpms drop slow when you drive it sometimes too..