Hi All
I have a 4.8 petrol and it started pinging under load and a bit hesitant on initial throttle opening after my last fill.It idles okay and revs okay when in nuetral but seems to be running rich and has lost power when pulling up hills . I have heard that valves need adjusting or something similar at regular intervals and i t has done 100,000 km but it just started after my last fill so any suggestions before I lighten my wallet looking in the wrong direction will help