This is a great site and I am happy to be a member!

I have a 2007 HD which I purchased new in 2008. It only has 55K miles and has had all scheduled maintenance. I need help with two issues: Intermittent severe missing under boost and cat replacements.

Sometimes my truck runs normal with no issues and other times when I try to accelerate the boost gage immediately goes to 4PSI and the engine misses severely. I have had the catalytic converters replaced at 22K and 45K. I think that there is a problem which Ford has not fixed so I maybe looking at another replacement at 66K miles. The two times I have had them replaced (under warranty) the service writers told me that this is not unusual and may have been caused by bad injectors.

I am looking forward to your ideas on what could be the problems causing my issues.