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Hi guys,
Doing the timing belt ant checking the chain tensioners in the next few weeks. I am thinking of replacing all the vacume lines under the inlet manafold. Any tips on how to remove the manifold with the engine still in the car.

It can be done, but it's a hassle. The inlet plumbing on the back side of the manifold has to be disconnected and moved away to clear, and it's all a tight squeeze. Also need to disconnect the fuel lines and remove the wiring harness from all the injectors. Definitely helps to have two people to help guide and move things to clear.

Personally I wouldn't do it "while you're in there", unless you know there is a problem to fix. By far the most common issue under the manifold is a failed suction jet valve, and you'll know this has failed because it messes with your idle and power brakes.

I have to do this because I have a knock sensor fault and I understand it’s under the inlet. Any help welcome gregg

I will do some testing before i dive into the manifold.
MAF readings are a little low. I will replace them and see if the readings come good. They are more than likely the original ones. No mention of replacements in any of the receipts.