Try cleaning EGR and your INTERCOOLER. If still hard going up the hills, intake valve cleaning. Typically, a normal tuneup won't touch these things.

Replace air filter (if u have not replaced it)


The uphill booster/enhancer just bypasses your ECU and dumps more fuel at select rpms to add power. Preferrably, don't install that, you might get a check engine light if the engine does not like what it does eventually.


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