2002 focus rough idle problem solved !i originally

hi,i originally posted a problem back in sept. about a rough idle i was having with my 2.0 spi engine.i would like to thank the two guys who took the time to respond to my post.the problem wasn't with the pcv valve or a rotted hose etc.itook the car to my local fastlane store.the mechanic went online with mitchell on demand and discovered ford has a tsb out on this issue.it concerns engines with over 100,000km having problems with exhaust valve sealing in the cylinder head.the fix according to ford is to replace the head.my car has only 87000km and is used mostly around town so the tech suggested running some intake cleaner through the manifold and for once luck was on my side because the idle smoothed right out.i hope this helps somebody out.