What fuse did they change? Are you sure it wasn't a relay or sensor they changed? You need to check the computer codes and test the fuel pressure. It wouldn't be a clogged catalytic converter if it happens only occasionally but could be a bad O2 sensor, fuel pump or filter, fuel pressure regulator, VSS (vehicle speed sensor), dirty throttle body or bad IAC motor, throttle position sensor, MAF sensor. See there's lots of things to check that's why you need to check the codes and fuel pressure first.
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