I’m buying new plugs on Amazon now. Don’t believe there’s anything wrong, me and my friend I was with are both diesel mechanics and they looked good to us. Been running 89 octane but will be switching to 91 next fill up. I installed a modified axle back exhaust on it a couple weeks ago. Straight pipe thru the muffler. Even tho there was no sensors or anything, would the little loss of back pressure affect anything? I wouldn’t think so, but it was the only resent change to the car within 5k miles
