Help boosting problem

[Bash's 850 R]

Hi all i think i have a boosting issues as at high RPM's its stops pulling and seems like its coughing/miss fire can any one help all the car is running on is a de-cat

[WOODY T5]

could be the spark plugs?

[p fandango]

or HT leads

[Bash's 850 R]

filled tank up with Vpower resently as ran on normal shell unleaded before could that be something

[Bash's 850 R]

could be the spark plugs?

spark plugs were changed with genuine volvo items 8mths or so

[Rnash2002]

spark plugs were changed with genuine volvo items 8mths or so
Would still have a look at them and also make sure the gaps are all ok.

[Bash's 850 R]

Would still have a look at them and also make sure the gaps are all ok.

which gap ?

[850t5]

This one. http://i785.photobucket.com/albums/yy133/Mr5050photo/Spark_Plug.jpg

[smithy]

check all ignition components mate like plugs leads cap rotor etc

[T5frankie]

i had the same problem yesterday changed the plugs now its fine again