I had the same experience this spring. The engine ran like it was about to die on me. I replaced the MAF sensor, coil pack, and ignition wires to name a few suspects. I also had an injector problem in the past. But none of that really helped. In the end, it was the spark plugs. One was absolutely dead. I would start by changing the spark plugs. 2014 4/4 Sigma engine.
