i have a 2005 150sri vectra spanner coming on at 3800 rpm (happened after refuelling from zero with the engine running) seems to be when im going uphill. no problem when im going downhill.(it resets itself when engine is turned off and on again) any ideas???
could be you've created a partial air lock. With the engine idling gently undo the fuel connection to each injector in turn ( just a quater turn will do , do not unscrew it all the way. If any air is present you will see air bubbles. Close the nut and test drive.