Just had new PCM, TPS & ICP sensor installed & now the turbo is slow to engage on take off & at low speeds. Once turbo pressure builds, runs fine. No problems starting & no rough idle.

Start using full-synthetic HDDO. Pressure builds much faster and they perform much better. Hopefully, there's no damage to the turbo--it's only a matter of time with conventional oil. As with any turbo, ensure there's plenty of unrestricted, clean air. Therefore, change air filters at least as frequently as recommended.

This link may help, especially Items 12, 13, and 14:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-8.html#post1415281