What is your question?
Ok, I have a rough idle on my Toyota Corolla 2003 but, only when is in operating temperature or warm, when is cold it idles fine. It looks like the rough idle is worst when is in reverse or drive and I'm still when in park or neutral the rough idle is not that bad. I have done several things to the car change the O2 Sensors, change the gas cap, clean the idle air control valve, cleaned throttle body, cleaned mass air flow sensor, change intake manifold gasket, change motor mounts, change the transmission mount, and a few other things that I can't remember and I still have the rough idle. I was reading online that it can also be a dirty fuel injector but really not sure what should I do and how can I diagnose if it's the fuel injectors or something else?. one more thing there is no codes on the car so really driving me crazy. One thing I forgot to mention when I am stoped and the I accelerate I feel like the car struggles a little like it does not have a lot of power.
What makes this problem better or worse?
worse when there is load added like turning on AC or Heater
How long has your 2003 Toyota Corolla had this problem?
2 years
Knowledgeable mechanic can do simple test to determine if engine mount(s) are the culprit. Engine can be lifted ‘slightly’ to see if idle roughness improves or disappears.
IF engine is visibly idling rough (shaking) then pursue possible vacuum leak - however the check engine light should be illuminated.