2011 Lancer wont go past 3000 RPM

I would check the exhaust is unrestricted and engine can breathe, so check EGR operation, PCV, and O2 sensors/catalytic converters. You don't mention a "check engine" light being on, so hopefully that means your catalytic converters are ok, but still check the EGR and PCV, those don't always result in trouble codes. Mechanics have a tool for testing EGRs. The PCV you can take apart and clean. There are plenty of other things that can cause loss of RPM, but these are simple ones to check as a starting point.