this morning I went to go to work and starting the car it reved really high I thought nothing of it but as i drove down the street i noticed it was lgging a bit and the engine sounded muffled it sounds like it sucks in air from exhaust pipe but not sure .
I did oil and filter change about 2 months ago
I am really stuck as to wat it can beeen
the car is a tj wagoon auto on petrol and gas

Hi, is it doing this on both gas and petrol?