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Well, looks like this is a common problem for Chevrolet Cobalts. I have the same problem with my 2010 Cobalt Vin # 1G1AD5F56A7167702. It is now 68K miles but it started with the revolutions jumping up and down when driving between 35 and 40 MPH more than a year ago. It was probably 58K miles by then. I took the car to Tires Plus for a checkup and they didn’t know what he problem was since no lights or codes were on showing any problem. They suggested to clean the injectors and I did without improving the problem. A few weeks ago I took the car to the Chevrolet Starling Dealer in Kissimmee, FL because the “engine light “ was on so I thought that was the revolutions problem showing up.
They said the Code that showed up was PO300 misfire detected and PO301 Cylinder 1 misfire detected. So they repaired the cylinder, the exhausted valves, installed new head gasket . The warranty covered the repair. As soon as I got off the dealer the revolutions started shifting up and down again, so that was not related with the engine light on. I asked for another appointment and they said that it could be electrical or the transmission but I needed to pay either check up because no light is on to go under warranty. So here I am, with a car not driving well and no way to repair until another light comes up.
I’m very disappointed with the car, for sure, will never buy a Chevrolet again and would not recommend to anyone. Maybe they are good on trucks but not in cars. The Chevrolet should make a recall if this is happening so often in this model. Not fair that we paid for a good car and we got it with fabric defects.
If someone in Chevrolet can help before the warranty expires, would appreciate, so at least I can sell it in good shape and not pass the lemon to another person.
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