Hello, I have a 2000 C70 HT Coupe that has the following symptoms/conditions:
1. Idles fine
2. No error codes being thrown
3. Intermittently the engine feels like it is misfiring under acceleration
4. Every once in a while the ETS light will come on (for a day or two) and then turn off. I notice no difference in the symptoms/conditions when this light is on or off.

Also the MAF was replaced roughly 2 years ago. What are the steps to properly diagnosis this instead of just assuming the ETM has failed? Is there any way to read any errors associated with the ETS light? Like I said, I have an OBD II reader and there are no codes being thrown.

Thanks in advance!