i have an 05 cavi with the eco 2.2. it started idling ruff a few months ago but not to bad. the one day i thought i heard a hiss like a vacum line but i couldnt find anything. now i got a code for a multi misfire and its idling like complete crap. also the brakes are fine 99% of the time but every once in a while the pedal goes to the floor and it stops really @!#$ty but then the next time its fine again. it does this randomly and only once a trip. im lost i looked at all the vacum lines i sprayed tb cleaner all around the breake booster and the intake mani.