peugeot boxer bad running,

[columboman]

hello, i am trying to fix my dads 1998 2.0 petrol boxer campervan,it has a slight flat spot and feels like it has a missfire in top gear, also some times it just wont start, just keeps winding over and not fireing, changed the plugs leads and coil pack and made no difference, has anybody had this problem, thanks.

[columboman]

new filter seems to have done the trick, cheers mate