I am going to try this strange thing that my KJ is doing. 3.7v6 starts and runs. Sometimes not always, sometimes starts and runs very erratic. what I mean by erratic is it stumbles, then will clear up. Runs fine for a slow ride around the neiborhood, 30 mph to 35mph. The only thing thing that happened in the 15 minute was, the accelerator was very sensitive at first, attempt, did not do every time. So I thought I could live with it. so I took it home thinking the thing was fixed, wrong!!! Got it home was running just great, backed it in to my driveway, and it started to stumble and run like crap, stalled, restart, run, stumble and quit. Start again work the gas pedal to keep it running, stalls... Restart all over again, same scenario. What is the problem?? I replaced the PCV Valve Replaced the AICV! Made sure no air leaks! Could it be a vacuum leak ?