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When my car idles it has a misfire and when I rev to about 2000 revs it will stick for a second or 2 and then start to go down I changed spark plugs ignition leads coil packs and coil packs ecu what else could be the cause

It’s running now replaced ignition coils board and leads but misfires when cold but perfect when hot

Just after service it was sitting sitting for 2 years

I have a 2002 Vy commodore that I got started today and it started up 4-5 times then I let it idle and it was misfiring so I started to check which Cylinder was misfiring so I unplugged one ignition lead and tried to start it it wouldn’t start then I plugged it back in and still wouldn’t start...