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[Kevin Wood]

were the plugs properly tightened?

And that means a torque wrench used....

And torque re-checking after they have bedded in.

[Andy H]

Is it the K&N type that is supposed to be oiled regularly?

Either way, when you replace, the GM one is the best.

yep  but Wayne usually asks me what brand and I tell him same as 99% on here only some are different-mainly what I use and mine IS Highest mileage mig on OOF-no doubt

Air filters treated with oil are known to kill the air flow meter (MAF). If the air flow reading is wrong the air/fuel ratio will be wrong. (which can cause pinking). Not sure how you can check the MAF without access to Tech2 to get 'live' readings.

Fitting a known good one may not prove anything because the fuel trims will have been skewed by incorrect readings from the old one (so Tech2 still needed to zero the long term trims).

[Broomies Mate]

I didn't think anyone used those 'oil as you go' air filters anymore because they play havoc with the MAF etc?

Surely a clean paper element filter is the way forward?

edit:  typing slowly wins no prizes! 

[Kevin Wood]

The Omega's air filter is so huge there's no point using anything but a standard filter.