You likely have an issue and trying to mask it with a tune is not going to help. Sticking EGR has been known to impact low end torque and power output as some of the exhaust gas leaks past the EGR instead of spooling the turbo. If you haven’t bypassed the EGR as yet, maybe try some blanking plate inserts to prove the theory then decide how you want to resolve it.
I am basing this on you believing it used to run better than it does now.


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