I have been having this misfire issue with my car where it misfires on startup then drives fine about 1000 miles ago I had this problem and changed all 4 spark plugs and ignition coils and it went away (Volvo issue spark plugs and coils) now I’m having the problem again so I changed the spark plugs no fix ignition coils don’t seem to be the issue either checked with multimeter. When I start the car takes a second to crank then idles at 1400 rpm and after a little it drops to about 800-900 during that time my car shakes and sometimes throws a code p0300 and whatever the code is for 1 and 4 after changing spark plugs it shakes sounds rough still but doesn’t throw code even if it did I wouldn’t be surprised if it were the same codes all in all after the initial earthquake car runs and drives great after warms up super weird this car has been a nightmare