Originally Posted by Danthurs
When you take the plugs out how do they look? Color etc. Take pictures and post them.
Thank you for the response.
I replaced the spark plugs with new AC Delco plugs. What was in there was platinum and they had some carbon on them. The idle speed improved and the power improved but the rough idle continues.
I had the car on the scanner for quite a while today, I let it run and warm up. After the car warmed open #4 began to miss, then #3 and #5. It wasn't constant.
There has been a whistle from under the hood and I decided to check for a vacuum leak. The vacuum hoses were replaced last year with new ones but the whistle continued. The whistle is near the EGR Valve and the vacuum hoses. It turns out that the metal hose that goes into the upper intake manifold is the cause. If I press on the metal hose the noise stops and the idle changes.
The car had a new upper and lower intake manifold put in by the dealer a few years ago but they didn't replace any of the EGR related parts.
My question is, what is that metal pipe called that is attached near the EGR and goes to the upper intake manifold? The hose is metal and attaches to a plastic part next to the throttle body. How do I remove and replace it? Does it require gaskets and if so, can I remove it and replace the gaskets or must the metal hose also be replaced?
What are your thoughts on this? I appreciate your advice.