I have a 2006 Toyota Corolla LE with 157k miles. For a while the starting has gone from firing right up to a slight delay when starting every few times. There is also a little hesitation and it feels like it idles a little low and sluggish.
So I have found everything I can about similar issues and I have replaced the battery and I just tested it and it was fine 13V+ and cranked down to 11V+. I replaced the intake manifold gasket, PCV valve, throttle body gasket and cleaned the throttle body with cleaner. I replaced the fuel pump module in the gas tank. I replaced the spark plugs (for the second time also did it around 80k miles), and also the ignition coils.
It isn’t throwing any engine codes, but it isn’t running like it used to. I am a bit out of ideas.
I have a crankshaft and camshaft sensors coming. My only other thought was oxygen sensors.