Engine not ticking over

[Guest nathan]

Please can someone help me?

I have a 1.8 Astra coupe x18xe.

I had an engine management light come on, i retried error code which was Air Flow Mass Meter.

Have changed this part with a second hand one, engine warning light went off and no folt codes come up but engine is still running extreamly rough, miss firing, stalling and no power.

I can keep it running for 10 seconds if I play with the throttle at low revs.

If I disconnect the air flow meter it doesn't miss fire just runs rough.

Can someone help me please, it's Christmas soon and I need my car!