Having trouble with my 98 ES starting warm and running at a slow idle (500 rpm in D). I can shut the car off and restart it after 15 secs or so and it idles normally. This happens most often after quick stops like getting gas. Never happens when cold. Has anyone experience anything similar? Thanks!

 

Vacuum leaks, poor ignition, too much fuel, too little fuel. IAC/ISC valve needing cleaning. Coolant temp sensor is going out.