could be an air temp sensor,you need a computer to check it but it controls air fuel mixture at different temp,almost like a choke but for modern day vehicles
Start simple. Try a tune up first. Then go from there. If the problem does not improve then start looking at more major things like injectors or a worn cam lobe. Hope this helps. Good luck.
A 2001 is difficult to power-up. Depending on your budget I would do a high flow intake and exaust. If it is an LPT you can always put in a bigger turbo with a higher flow. If it is an LPT look for a turbo beginning TD014. The next numbers are the different performances e.g. 18T 19T. After that get a custom tune flashed into your computer. If it is an LPT, a 19T with these mods can increase the power to almost 300hp.
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