Originally Posted by BRappaport
I had rough idle problems on and off as well...and then my check engine light came on after a few weeks later...I took it to the dealer...he read the codes...no new codes...but there was an old code stored that pointed to a bad air injection pump. In the very front of the engine...there is an electric driven air injection pump...which injects air into the intake...sort of like a choke to lean out the mixture. You could feel air coming out of the pump where theirs a gasket...pump should not have any leaks...this was replaced and solved the check engine problem and the rough idle...but its only been a week since the replacement. I will give an update in a couple of weeks. Hope its fixed for good!
Glad it solved your problem but just a correction on the air pump statement. The pump actually injects air into the exhaust manifold via the cylinder heads, not the intake. Its to help raise the temp of the cats during warm up.