mk2 16v random missfire problem

[01664gti]

My mk2 has all off a sudden developed an intermittant missfire on start up.Sometimes its fine and then others it starts but missfires for a couple of secs and then runs ok.

It does sometimes fail to start but after a couple of tries it eventually goes.

It has been fine up until now and the only thing i have recently changed is the isv but tht was for a second hand one.

Any ideas what could be my problem???

[Diamond Hell]

Errr, the second hand ISV?

Also check the spray pattern of the fifth injector.

But do it somewhere safe, away from flames and sparks and such-like.