I just got done polishing my plenum and runners...I got everything hooked up again...then I went to start it...it ran for about 10 seconds and died...I heard weird noise coming from drivers side of engine..sounds like a hissing of somesort...also when i give some gas to keep it running the rpms kick up and drop right away...they dont hold its rpm...NEED HELP PLZ!! THinking its a sensor or something...but the check engine light does not come on....

 

Sounds like a vacuum leak, should post this on the TECH/Engine board though.