I can't seem to get a good answer on this. I put a 4.0 throttle body on my 2.5. I did it on my last TJ and liked how it ran so I did it to this one. Problem this time is if i tap the gas it runs uo to about 1200 rpm's but only dops down to 1000 rpms instead of around 700 like it did before the swap. Also, If I'm driving and I go into neutral and slow down, the rpm's drop only as I slow down. I thought when you take it out of gear the rpm's drop to around 1000 then to idle as you stop. I'm not getting any codes and I thought the computer adjust to the change after a little driving. I used the map sensor that was on it but I changed back to my first map sensorhoping that might fix it, no luck. what'cha think?