Ok...so I have a 1JZ GTE swap in an 87 Supra. Ever since I have owned it it has run perfectly and very strong. I even held off an SRT8 Charger the last time I drove it. I drove it today just fine and I put in a little gas cuz it was almost empty and I accidentally put in 90 octane which I didnt think would really be a big deal considering the highest we get here in Albuquerque is 91 and I only put in a few gallons, anyways...I was on my way to work and it started feeling like it was missing while I was under light acceleration. I knew I had lower octane in it so I wasnt trying to boost or anything I was just driving normal. Then the missing got worse an started kinda backfiring so i pulled into a gas station to see what was up and top off the power steering fluid cuz it was really low and I thought possibly it got low and maybe that was causing the belt to seize and fuck with the engine. IDK it was a long shot I guess but anyways it died as I pulled in to the station. It kept starting up but it would only run by giving it gas or it would die. Due to some other drama goin on at my house I was forced to drive back to my house and it was running terrible completely erratic and backfiring all the way back. when I finally got to my house the exhaust was smelling strange. I don't really know if it was a sweet smell like I blew a head gasket but it wasnt the normal smell which is usually the smell of oil because the stock twins smoke like crazy because I havent replaced them yet. So possibly it could not be running on all cylinders and it was the smell of fuel mixed with the burning oil?? I have no idea ...like I said it was driving fine and I wasnt beating on it or even boosting and it started all this and the oil didn't look milky at all so I have a hard time believing it was a hg...So with all of that said...anybody have any clue what this may sound like?