Had this listed for nearly a week no replies reposted when fixed it now loads of replies not jumping the gun just coudn't understand why no one could reply sooner to what i thought was an easy question to answer to anyone with a boost gauge and ok running car
the repair consisted of replacing the dump valve (slight leak)
washed the air filter (precaution)
and 2 loose connections on the intake plenum (vac pipes)
spent most of my childhood in garages as my father was a mechanic/mot tester but he's no longer with us so could not ask his advice