i have a 2001 Toyota celica automatic and the past few times i have started it and tried to drive away it kind of rolls and no matter how much i push on the gas it just refuses to accelerate for about 8-15 seconds. reverse, forward anything! at first i thought it was because i had been slacking on changing my oil but i changed that and it still does it! could it be vacuum problems? old spark plugs? dirty air filter? please tell me its not going to cost me a fortune!