I went to Autozone and the codes are
P0340 - Cam Shaft Position Sensor
P0455 - Evaporative Emissions Problem
I don't know alot about cars any help would be awesome
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These are two very separate problems, though you could try just having the codes cleared first (since they have been read, hopefully they have already been cleared). With the brevity of the question, I'll assume you did this and these are the two codes which have remained. Soooo ...
The P0340 has to do with the cam position sensor. This seems like a fairly common problem on PT Cruisers. With this problem the car would go into what is called "limp home mode", where the engine will max out at about 2,500rpm. Sputtering and such seems fairly common here, also. Replacement of the sensor is relatively easy and could be accomplished by anybody with a good mechanical sense about them in about 10-20 minutes.
The P0455 code has to do with a evaporative emission control system leak. This problem is a little harder to diagnose exactly what is going on. The possible causes here are: