[Excaliber]

It's low octane for the compression all right. It MIGHT clear up if you drive it awhile and flush out the old gas and go with new. If it persists higher octane fuel will usually stop it. What I do is simply leave it in first gear, ease out the clutch until I feel the car wants to move, turn off the key and finish letting out the clutch with my foot on the brake. Deiseling is really bad for your motor, whatever you do, STOP IT from happening, NOW.