When I start my zafira it revs up and down around 1 the engine sounds like its going to stall but revs back up a little pop coming from back of engine possibly by manifold and when driving at low revs there is not much throttle response iv changed spark plugs coil pack and a little airflow thing on top of engine but still the same can any body help please

stuart, July 2015

Often on modern motors the best way to determine what is going on is to get the motor onto a good computer which looks at live data and determines what each sensor,egr valve etc is doing,what fault codes are stored,but if you keep guessing it is quite probable you will end up with a very large repair bill.

cdc, July 2015