2008 Cobalt LS Problem with Acceleration/lack of Power/hard Shifting
I've been having a problem with my cobalt for last year or so and it's been getting progressively worse to the point that I can no longer ignore the issue.
When I accelerate, my RPMs fluctuate and I feel a jerky feeling. As I continue to accelerate, the RPMs will drop a couple hundred RPMs about every second or so causing my car to feel like there's a slight "buck" to it. Similar to (although not as dramatic) the feeling of pressing on the gas, letting off for a sec and then giving it gas again over and over again. The problem sometimes persists when I have a constant RPM (like I'm maintaining speed). It's like the fuel injectors aren't injecting the fuel properly. The power definitely doesn't seem optimal either. Neither does the fuel economy (although I haven't tested it, it just seems like it's not as good) It doesn't matter what gear I'm in or how fast I'm going. I noticed the problem about a year ago, but never did anything about it. It didn't seem like a real big issue but it's been getting worse. Took it to the dealer and they want $130 just to diagnose. I've run injector cleaners, etc but to no avail. I'm hoping someone here has had a similar issue and can shed some light?
Another problem I'm having is that my transmission feels like it's shifting hard especially in city driving. At times I get a noticeable jerk when it shifts. Doesn't matter what gear its in. That also has been getting worse.
I've never had a check engine light on, and I've also been very faithful in oil changes.
Ps : mileage is about 86000, and I guess you can consider me a "hard driver" a majority of the time.