Thanks for all your suggestions!

Deb, I did what you said and it does skip the larger cogs no matter what chain ring I'm in. I tried pulling the cable tighter like you said, I also referred to my bike maintenance book and it said to turn the cable adjuster on the rear derailler. Tried both and still kept skipping. So, off to the lbs it went. I should get it back tomorrow. It's thunderstorming today so I'm not missing any good riding. Hopefully I'll get it back tomorrow.

Thanks again!
-m