Stumped by error code
 

Hello all. I drive a BMW 325is 92 E36. My check engine light is stuck on and I can't find much info anywhere on troubleshooting. I get the code 1263 EVAP, Purge Valve. The car has had a rough idle for a while. Nothing too serious but when it approaches a stop sign or red light the car will jump around 1500 to 1700 RPMs before settling down to 750 RPMs after coming to a complete stop.
I have checked my vacum hoses and air intake and there were some issues (hoses and whatnot). I have since fixed the issues and appear to have fixed the air intake issues but the idle problem remained.
Now here is where it gets weird. I did some reading on the code and it was suggested that you start with the gas cap. I replaced the gas cap with the designed cap from NAPA on the way home from work last night. This appears to have helped the idle issue but the check engine light remains and gives off the same code, 1263. The car idles correctly at this point but any help on the code and the light would be greatly appreciated.:thanks

That hard

You just need to clear fault codes at this point? You can enter fault reading mode by turning the key to the ON position and stepping on the accelerator (to the floor) 5 times in 5 seconds. To clear codes while in self diagnostic mode simply depress the accelerator for 10 consecutive seconds. This should give you a code of 1000 which means that the system is clear.

1263 Code
 

I have tried clearing it out but I get the same results. Would having no Catalytic Converter cause the issue? I also cleaned the ICV valve and the cars performance greatly improved. The car is running like a champ but I can't get the code to clear.:thanks

When you try clearing the code, does it come back with the key in RUN with the engine OFF? Or does it come back when you start the engine?

Code Issues
 

The code returns after running the car for 5 or 6 miles. I can make the code come on faster by running at higher RPMs. The only issues that I know of that could cause an error code at this point are: 1. There is plug that is taped to the Mass Airflow Sensor that does not appear to have a female counterpart. 2. No Catalytic Converter. I appreciate the advice.

I have spoke to a few people about the Purge Valve and it's actual function and I have been told that it is minimal. The car really doesn't NEED emmisions but I want to get good gas mileage and it would be nice to fix the issue. Once again, thanks.