hI I really need help working this out....my 2004 camry sportivo suddenly started using massive quantities of fuel yesterday, five eights of a tank for just 20 /30 kms around town. No obvious fuel leaks, no black exhaust or fumes, no hard driving....is intermittently running rough and surging, feels ike driving with choke fully on ( even though no manual choke) Any suggestions would really be appreciated in an effort to save the looming hundreds it will cost if I take it to Toyota etc