Check engine light and the car continues to shut down to reduced power service esc service traction all these warnings. I have had code for the purge valve the canister vent valve the fuel pump the throttle body and have replaced all of these things reset codes and while driving through the first cycle the car all the sudden the engine power gets reduced and i have to pull over the engine light and traction control light are back on and so i start the process again I can not pass emissions please anyone

Hi rpm in park. I've replaced the TPS, the IAC, the coolant sensor and I've checked all the wiring. It still hits around 2-3000 rpm in park and is burning through gas like there's no tomorrow. Next step is the mechanic but I'd like to fix it on my own if I can. What's the issue?