I've been trying to figure this out for over a year now, and at this point I'm about to just get rid of this trash ass car if I can't fix it. About a year ago I noticed my car decided that when it get to it's normal operating temperature, my idle rpms sit at around 600 and dip to 300 if I move the wheel, and when driving it, it accelerates really sluggishly, especially on inclines where if I'm not careful, I'll stall when I try to put it in gear. This is a 13 manual base btw. I have tried to find a solution for this problem for so long that honestly I have no idea what to do anymore. Sometimes I'll have to damn near floor the accelerator just to put it in gear. I cannot for the life of me figure this out and it's making me incredibly frustrated. I drove a toyota camry recently which has similar horsepower and my car made that one look like a sports car. There doesn't seem to be any leaks, the spark plugs are brand new, the air filter is brand new. I have no idea what to do with this car.