2002 ford focus rough idle when at operating temp.

[Andy S]

car has 85000 km and is equiped with spi engine.engine works fine under load and idles fine when cold.any ideas?thanks.....AndyS

[cruzininmyfocus]

Did you check the pcv line?

[Davescort97]

Vacuum leak in the intake system or the vacuum hose going to the elbow in the top of the engine. The elbow is known to splilt or get a hole in it. Check for characteristic whistling of a vacuum leak.