I checked the codes first and got code 13, coolant temperature sensor.

Could that really be causing my RPM's to fluctuate? I'll try bleeding it next.

Bled the system, but that didn't do the trick.

So I got a new coolant temperature sensor, since it was showing Code 13. That seemed to do the trick. I haven't taken it for a test drive, but I started it up and the idle was a lot smoother and it wasn't falling. But I did notice some spray the came out the back of the exhaust, not what sure that was, it wasn't a lot.

How do I clear the code? I downloaded some instructions and it said to go to Mode 4. But it said nothing else.

Remove battery for 15 minutes??? This usually works.

some codes will clear by doing this but not all. the correct was is to go to mode 3 then mode 5. to be sure you did it right go back to more 3 and you should get code 55.