That's true. I had intermittent lag regardless of temps even when my car was stock, and changing the brake switch resolved much of it.
Then the lag I had recently was pretty bad after an engine start, but it was also intermittent. I could hold it down in 1st and 2nd, and the engine felt like it had half the power and boost didn't even build up. It appeared to be caused by my HFC wanting to clog up (confirmed) due to running rich with the turbos. I also found an exhaust leak in which my last tech did not reuse the gaskets for the HFC.
My car is running so much better now with the test pipes. There are still times it doesn't seem to want to open up, but it's nowhere near as bad. Next up is filter cleaning after over 30k miles and also clean the throttle bodies. It might be sticky.
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