Check Engine Light On problems of the 2007 Chrysler Pt Cruiser

I am frequently experiencing the following problem which includes the check engine light coming on, the car not wanted to accelerate, feeling like the car is going to stall while driving down the road. One time it did stall in traffic however, it started right back up. The check engine light does go out. I have taken it to several car places and no one has been able to diagnose the problem. This is a serious problem as I am afraid to drive the car. It has happened at varying speeds and weather conditions, from 20 - 60 miles per hour, local road to highways, warm days, cool days and everything in between. It is hard to predict when this will happen but is an issue that should be addressed before something serious happens and people are injured.

The check engine light went on and code po456 was on. I had to replace the gas cap as there was a leak. I have had to replace the gas cap two times because of leaks.

While driving a Chrysler Pt Cruiser, the engine light went on. The car started to jump and quick and short spurts of stalling, while on the roads. Problem occurs off and on since.

I purchased my new 2007 Pt Cruiser from hayes Chrysler Dodge Jeep, inc. In lawrenceville, GA on January 27, 2007, with 32 miles on car. I was instructed to drive the car and return in three weeks for a new car check and list my concerns regarding the car. At this time in informed the service staff that the car did not excelarate when entering the freeway and passing other cars. The service staff returned my car to me indicating that they could not find any problems with the car. A few months later the car check engine light came on. Again the service staff told me they did not find any problem with the car. My check engine light came on serveral time after my initial return each time the service staff did not find any problem. Each service visit I informed the service staff that the car still did not excelarate. On a routine oil change I spoke to a new service staff empolyee, told him of my concern and dissatisfaction with the car. After waiting for over an hour, I was told that they had finally found the problem (69k plus miles, 3 years later) the engine had misfired cylinders. I was told that apparently all this time the computer in the car and the engine were disfunctional and didnot communicate. The service staff attempt to fix what I would call a defective parts. After the fix the car still did not perform. About three weeks ago the repair failed. My check engine light came on and I was told that what was fix had broken. I was also told by the Chrysler corp. Engine trouble should be discovered during a routine oil change. It was not in my case. It took three years of routine oil changes before they discovered the problem with the defective engine in my car. I feel hayes & Chrysler corp should be responsibile for the re-repair. Can you help or adivse where I can seek assistance. Thank you.