For the last 3 Months. Every third cold startup or so, I get a misfire code on Cylinder #3 (P0303), and twice or three times gotten a "Multiple Cyl Misfire" (P0300).
Car has 144K
Always gentle warmups, waiting 20 seconds for idle to slow from 1500 before moving.
Stock Tune, Filters, FMIC, the whole deal.
Replaced spark plugs when Misfire codes started (Volvo OEM)
Traded Coilpack #3 and #1 to see if problem "moves" with part, to no avail.
Car doesn't buck for seem like it's misfiring at all, MIL usually comes up at 15 MPH.
Could this be a bad knock sensor? Your input is appreciated.