My 99 buick regal gs is idleing up & down, it will idl up to 1500 then down to 500 and want to stall out. it died on me the other day, i restarted it & it ran fine to get me home. ive since only started it in the driveway and itll run fine then idle up then down and want to stall. i dont know what to do, help!

Sounds like either a vacuum leak, or an idle air control valve. If you don't know much about cars, then you'll probably want to take it to a mechanic. If you look at all the black rubber and/or plastic tubes/hoses, you might be able to find a deteriorated, rubbed through, or broken tube/hose at the ends, or where they intersect other components and could be rubbing. I would definitely start with checking those out first. I hope this info helps!

Check the engine breather pipes ,they could be perished and sucking in air