Autocross in the morning and the car wont run. please help!!!

[RickSloan]

the vaccum gauge in the car is reading at 20 for a majority of the time when the car is running poor

[Syncro325is]

car wont keep a steady idle, when driving it, it "hiccups" shoots a flame out the exhaust and then drives fine till the next hiccup(which are frequent). checked for vacuum leaks, and did not find any. wideband shows the AFR to be all over the place both rich and lean.