My 99 5-speed 4.0 (120k miles, no oil leaks, no oil burning, recent tune-up) dogs our terribly on hills when I'm in 4th or 5th gear. It's the worst on the highway (and I live in CO). I have to shift down to as much as 3rd gear to get it back up to 65 while on a big hill. It does the same in town on steep stuff in 4th or 5th. It's also nearly impossible for me to go over 75 on flat roads. My tires are 30" and I have a 2" lift.
There really are no issues with the car other than the idle fluctuates slightly at rest due to a dirty ICM. The throttle body is clean. I have a K&N filter and 2" custom exhaust all the way back. There is a little glug-glug sound when decelerating in 4th-2nd. But that's really it.
Any ideas on what's causing this?
There really are no issues with the car other than the idle fluctuates slightly at rest due to a dirty ICM. The throttle body is clean. I have a K&N filter and 2" custom exhaust all the way back. There is a little glug-glug sound when decelerating in 4th-2nd. But that's really it.
Any ideas on what's causing this?