boosted my car. got it tuned and the tune looks real good and the wideband looks real good. but for both different tune's ive had, we cant figure out why soemtimes at idol the revs jump around and the vacuum jumps around too. some starts it does it, some it doenst, and a very few starts bog down and i have to keep the foot on the gas to start it. whthere than that at start up my idol is set to 1000rpm and wideband reads 14=15ish. . ayone have any suggestions as to why its doing this and how to fix it???

motor is a b16a2, changed all vacuum lines and it still happens