Originally Posted by MJ_RST

Ok, got round to changing the rocker cover gasket, and plugs......drove ok for a day, now seems even worse, wont accelerate above 4K rpm at anything over 1/4 throttle!!

MAF unplugged and exhaust de-catted so rules out both of them

Any other suggestions??

Originally Posted by babscossie

unplug the mass air flow meter on the intake next to the airbox, then see if the problem has gone.