I don't have experience diagnosing ETM issues. If that ETM fuse was blowing, then I guess the ETM electronics were calling for/drawing way too much current. Maybe check all the wiring/connections pertaining to the ETM? Maybe check/clean the ground connections in the engine bay? Does the fuse for the ETM also monitor other components? Check your owner's manual.
I've read that if you think your MAF is acting up and causing poor idle, you can try unplugging the MAF electrical connector and if you get a steady idle, then the MAF is suspect.
If you think your problems are related to a timing belt change, then you gotta check your work. Supposedly, if the new belt is one tooth off you should get a code after some driving.
It certainly wouldn't hurt to do a VIDA scan. A DICE setup is about $100 and there is a learning curve but plenty of info on the web.
2007 XC70, 206,000 miles
2002 V70XC, 130,000 miles, parts car
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