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For this reason I have discounted vacuum leaks, dodgy MAF as I guess these would not be so temperature dependent. When pull the codes it is always both lambda sensors showing no activity and random misfires; however I suspect this is symptom rather than the cause.
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You cannot discount them. While lambdas are warming up engine runs on open loop. Once lambdas warm up it runs on closed loop based on lambda feedback.
So if you have vacuum leak it might be running lean before lambdas kick in. If You have faulty maf it could be lean or rich before lambdas star working.
And if it is very lean lambdas might never start to show activity.
Check vacuum leaks first