focus 2.5 2010 1.6 zetec petrol

[CLIVE_D_B]

hi guys. after a bit of help, if i may.

have a 2010 1.6 petrol focus.

does start fine. but every now and again, it is difficult to start.

have to turn it over maybe 2 or 3 times to get it to fire.

after that its fine [most times]/ sometimes it'll misfire, then clear.

have replaced air filter, spark plugs. even given it some redex.

but unfortunately its still the same.

any help would be truely appreciated.

thanks in advance.