Originally Posted by mocolotion

It sounds like you have too much slack in your cable so the shift lever is unable to pull the front derailleur far enough to clear the chain when you're in your big chainring/small cog combo. I recommend putting your bike on the small chainring and big sprocket, then pulling the cable tight from there. Once you've got the cable tight you can use the limit screws and barrel adjuster to fine tune the shifting.