98 Hyundai tiburon--uneven idle

I have a 98 Hyundai Tiburon--the 4 cylinder, it's automatic.
When idling, every once in awhile the idle speeds up for no
reason and then slows back down. The garage is telling me
its a warped or bent cam shaft. I'm not buying that. How
often does a 4 cylinder get a bent cam shaft?? (This car
has never been wrecked--even wrecked, does the cam shaft
get bent--unless it's head-on totalled.)

Suggestions? New computer chip? New oxygen sensor?
New idler arm or something? Definitely going to a new
mechanic. I swear they see a girl coming, and the $ signs
ring up in their eyes.

Thanks in advance!

 

has all the maitenance been kept up?
and yes thyre trying to rip you... stay away from them...
go get your computer scanned at a reputable hyundai garage.
idler arm is a front end compoment not part of the engine..

 

It could be something as simple as a poor connection at the throttle
position sensor.