The old rough idle when engine is cold syndrome

[agolfr]

Since there are so many posts on this subject I thought I would enter actions I took with the problem.

1. Clean the IAC - Still had problem
2. Installed new IAC - Still had problem
3. Clean the MAF - Still had problem
4. Installed new MAF - Still had problem
5. Clean the throttle body - Still had problem
6. Clean PCV valve - Still had problem
7. Installed new PCV - Still had problem
8. Installed new metal expandable hose clamp on PCV and
tighten - NO PROBLEM, IDLES SMOOTH AS A BABY'S BOTTOM

 

[snoborder42]

Does the engine idle rough all the time? It could be the o2 sensor. Mine idled rough all the time but especially when it was cold. I replaced the o2 sensors and it runs like a brand new engine. I also bought some throttle body cleaner and cleaned the throttle body and mass air flow sensor. Hopefully this help you.