Could be any number of things. Bad coil or weak spark, low fuel pressure or clogged fuel filter. A breakdown of the ignition subsystems equivalent to points and firing sensors.
You should check EGR by very temporarily plugging vacuum line and see if performance is changed. Sometimes blocked exhaust Catalytics or collapsed muffler baffles will plug up the exhaust and require too much push to clear the pipes.
SOURCE: speedometer not working
it very well could be the instrument cluster, i believe ive heard of this before. shifting is ok? may want to call dealer with vin# and see if there is a service bulletin on this problem. i may do a search as well
SOURCE: 2007 cobalt engine hesitating during acceleration
any ck engin lights could be bad gas or spark plug or coil pack braking down
SOURCE: Engine shakes and can not accelerate as quick when starts
If the engine light is on, a code scanner needs to be connected to it to find out why the light is on. It could be one of the sensors causing it. Take to autozone or advanced auto if there is one near you, if not call a repair shop that can do it. Autozone and advanced don't charge. Takes about 30 seconds.
SOURCE: I have a 2003 Chevy Tahoe. No problem this
have the codes pulled this will get you in the right direction most autozones and the like do it for free
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