2003 Montero Limited Rough Idle/ Hesitation
I have a 2003 Mitsubishi Montero with a rough idle and hesitation issue that has improved somewhat after repairs but still isn’t fully fixed. Originally the truck had a MAP sensor code, IAT code, and a misfire code along with rough idle, low RPM sputtering, and a hesitation from a stop. The symptoms were always worst in Drive or Reverse, where the idle would sometimes drop to around 500–600 RPM, shake badly, then suddenly jump up near 1k RPM and smooth out. Under acceleration, especially from a stop or low speed, the truck feels like it hesitates or holds back before suddenly catching and accelerating normally. I replaced the MAP sensor and afterward the MAP and IAT codes disappeared. I also found one physically broken coil pack and replaced it with an OEM coil. After replacing the coil, the roughness in Drive and Reverse improved and the truck drives somewhat smoother overall, but there is still hesitation at low RPM and the misfire code remains. At this point I’m trying to figure out what the remaining issue could be, any help would be appreciated!