I have a 2008 Cobalt LT Coupe with 45k miles on it.. It has the 2.2L Engine. Anyhow ever since i bought it a year ago ive noticed its throttle delay, If i give it some gas, it hesitates then after a second or two my RPM's kick it. That's not really what scares me though.
Every once in a while, my car accelerates without any reason. Even if im braking, sometimes i would get random RPM punches.
Today however, it happened a few times, which is a lot considering this happens maybe once or twice a month.
I was braking towards a red light and as i was down to about an engine idol and going about 5-10 mph, my RPM's kicked in at about 3.5k and i had to brake hard from not hitting the car infront of me, scared the shit out of me.
Any known cause of this?
Would a bad spark plug cause a random misfire like that?