Check the plug caps are tight on the Leads. Startup misfire is common enough if they are loose.
If they are are loose unscrew each of the 4 plug caps in turn and cut 10mm of the end of the lead and screw the cap back on.
That usually resolves it.
If they are are loose unscrew each of the 4 plug caps in turn and cut 10mm of the end of the lead and screw the cap back on.
That usually resolves it.