Could be a vacuum leak but there are only about 8 vacuum hoses under the hood so it should not be to hard to find, however if you spray to much quick start the leak will pick it up even if its on the other side of the hood this can be confusing to find. The problem could also be that you have a hose clamp loose on your throttle body or air box and you may want to check the probe going into the side of the filter hosing to see if the gasket is on it.
