You say you havenít done any mods in years, so the car is modded then? What mods do you have done to it? Is it running the stock tune on mods? Even with minimal mods, considering your car is probably past warranty for these small issues, I might consider having a tuner look at it for you. Might fix all the issues for you.
2013 Evo X GSR
Built 2.0 Shortblock, Wiseco 9.3:1 Pistons, Built by MAPerformance
GSC S2 Cams w/ Beehive Springs
ETS 3" Intake | ETS 3" IC Piping | Turbosmart 3-Port BOV (Red Spring) | GS 3-Port EBCS | AEM 340 FP | ID1300 Injectors | Ported MHI 18k Turbo | WTF Flex Fuel Kit | Muse 4" Intercooler | Muse O2 Dump 3" Downpipe | ETS 3" Test Pipe | Magnaflow Muffler
"Live life one gear at a time."