It does not seem to be any specific pedal position nor any specific rev. It is always generally different. I have even had it happen going up a hill with cruise control on.
Fuel pressure might be a little tricky to check. As for the fuel filters, they are inbuilt to the pump which is located in the fuel tank. Meant to have a "life time" serviceability according to Jeep.
Brake booster vacuum leak ? How will that affect acceleration ?
I initially thought spark plugs as well but apparently they have a life of about 100-120 km. This started happening at 50km.
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