misfires

2007 3.7 limited. i’ve replaced all 4 O2S, and replaced the three driver side ignition coils. i’ve removed and cleaned all spark plugs, and gently cleaned the MAP sensor with appropriate spray. this problem is almost unnoticeable until about 70-80kmh, when my revs will die down to about...

I have a 2011 Jeep Liberty Sport 4WD, 3.7l OEM status. I have had various ODB codes over the last few months, starting with P0133 and P0420. I replaced both upstream O2 sensors and also the spark plugs. It ran well for a few weeks and now is much worse with rough idling and more codes. The...