MISSFIRE AT 6 GRAND.
 

MY CAR IS A CLASSIC 555 STI 96 N REG. IT USES A FULL BOTTLE OF OCTANE BOOST WITH A FULL TANK OF OPTIMAX. THE MISSFIRE THEN STOPS AFTER USING APPROX HALF FUEL THEN STARTS WHEN RUNNING LOW. HELP WOULD BE GREATLY APPRIECIATED. REGARDS NATHAN.

Only thing I can think of that causes stuff like that is the fuel tank breather but that doesn't sound right for your circumstances.

THANKS FOR THE REPLY PAUL MUCH APPRIECIATED. NATHAN