Trained (ex)Professional, , 1953-2018 RIP
I drive the car maybe once a week a distance of 8 miles.
I'd bet fair money that you have a dead miss. Meaning that one (or more) cylinders are not firing. A fouled sparkplug would top my list because of a very short 8 mile drive only once a week.I noticed the idle sounded clunky. The tailpipe seemed to rattle a little more than usual. ...the car had limited power... (never got enough power to get out of first gear).