Recently my Jeep seems a little bit jittery when holding speed at 50-70 mph, sort of like the engine has trouble settling in at a constant rpm. I used my Scangauge to check the RPMs, gas mileage, etc, and it is not my imagination. Every 5-15 seconds there is a slight surge in RPM of about 100 or so, for example: the engine goes from holding at 2000 to about 2100, then settles back in at around 2000 again. At the same time, there is a corresponding drop in immediate fuel economy, like from 21 to 18 mpg, but then recovers back to 21. It happens both on cruise control and also when keeping the skinny pedal constant manually. I have used my Scangauge for 6 months to keep tabs on gas mileage stats as I drive, so I am pretty sure these rpm fluctuation symptoms are a new development in the last 2000 miles or so. It is most noticeable on the flat, or on a slight incline, on the interstate highway. I don't notice it in town at slower speeds. There are no CEL codes or pending codes, and for now this seems like an annoyance rather than a problem, but my gut tells me it will become worse over time. A quick
brought up the idea that the Throttle Position Sensor (TPS) might be going bad, or possibly the torque converter was disengaging and engaging. However, none of the posts I found were about KK's. Anyone else have this problem, or is there a Jeep mechanic on here who's seen this before? Thanks in advance! --LFH