I run my car on 94 octane in canada, but I couldn't find any here in eastern washington so I put in $15 of 92. i figured it would be fine as long as i didn't boost, but it just backfired and went really slow, stumbled, bogged, and my wideband read like 10 and under if i tried to accelerate atall. I figured it was old gas that I got, so I drove to the next town (couldn't go 60 it was so bad) and put chevron 92 in it and some octane booster (I learned later that octane booster doesn't increase octane by more than a couple points like .3) it runs a lot better now but it still runs rich and backfires. I am scared it's pinging and don't want to drive it. do I just drain it cross the border and run 94, or do I chalk it up to bad gas, drain it and try 92 again? oh i have lex MAF 550ccs and an safc.