I posted a thread last week about poor performance and got some good advice. The problem is still there in that my Astra 1.8 SXi (20020) is not performing well.
At start up from cold it doesn't idel well, it almost stalls then rev counter move between 600rpm and 1500rpm for a minute or so before idling at correct speed.
Driving around town is not too bad but when trying to accelerate on the bybass there is a distinct lull now and then as if there is a fuel blockage.

I have put new fuel filter in, cleaned throttle body thoroughly, checked spark plug gap (I changed them in January), fitted new coil rail. Don't know what else to do.

I had fault codes showing number 3 cylinder misfiring but since clearing the codes no more have shown up.

Getting frustred now.

Can anyone suggest anything?