2010 camaro reduced engine power message - 1999 Chevrolet Camaro

Could be as simple and a coil pack or plug wire. Try switching with another and see if that fixes the problem. If so there ya go.

You need to get the computer trouble codes scanned
Check engine light on Part Ricks Free Auto Repair Advice

Any light's lit on the instrument cluster ? check engine ,message's -engine power reduced ,yellow wrench symbol etc....

Jerry, Drive to a good shop. So many things can cause reduced power light unfortunately. The first step would be to get the truck hooked up to a scanner/computer and have the computer scanned for trouble codes. One thing that you could try is to drain the water from the water separator that is mounted on the frame under drivers front door. If the PCM picks up on water, power is reduced until water is removed/drained. It could be an exhaust sensor that is reading faulty. Unfortunately from here its impossible to tell you exactly what the fault is because there are just so many engine sensor inputs that could cause your problem. Check the attached links, forums,instruction and guides, Good luck
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2003 Silverado 2500HD REDUCED ENGINE POWER - Discussion on Topix

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Dec 28, 2009 - 20 posts - ‎12 authors I have replaced the throttle body, had the wires re-connected and .... The gauges all went wild and reduced engine power displayed on the dash. I looked it .... The truck just went to idle for no reason and it keeps happening. 2003 Chevy Trailblazer-CHECK ENGINE LIGHT AND ...
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Reduced Engine Power Message Displayed on GM Vehicles

www.underhoodservice.com/tech-tip-reduced-engine-power-message-dis...
Dec 10, 2012 - Tech Tip: Reduced Engine Power Message Displayed on GM Vehicles ... Model year 2008-'10 vehicles must have the engine control module (ECM) reprogrammed ... Do not drop the electronic throttle control components.

The fault codes have nothing to do with it sitting for a few days. There are sensors that work with your ABS brakes and TCS to help your car maintain control when corning briskly under load. You probably have a bad sensor on one of the wheels. Recommend you get the Haynes manual to see exactly how to test and replace them. A multimeter will help too.

Unless you are a qualified and certified mechanic (if you were, you would not be here asking how to fix it), take your vehicle to an authorized dealer, and get them to fix the problem. IT IS NOT SAFE TO DRIVE YOUR VEHICLE, especially during winter, until you get if fixed. Or, trade-in the vehicle.

had the same trouble with my '10 impala it turned out to be defective electronic accelerator pedal it is actually a recall for this vehicle and should be a free repair at your dealer.

Probably you should check or change your filters. Air and fuel. Fuel filter is most likely.

ecm/ecu/pcm...computer.