2011 nissan xterra x
I have an 11’ xterra x with 171000 miles. Just bought it and almost immediately it started to act up. Obvious misfire at higher speeds. Vibrates really bad on hwy. ran codes and started by doing a tune up. Changed all plugs and all coils. Changed valve cover gasket. Took my propane torch all around the hoses and i didnt find and vacuum leaks. Took it out for a drive to the store and when i got back in it at the store it wouldnt start. Waited for a while and got it to start and drove home. I then tested the fuel pressure with the kit test and tested normal. Since then it starts every time however continues to misfire. Im out of ideas here. Help!