Sigh - I've got so many sins...but I think my worst one is a tendency to get lost in my own story! I'm so interested in what's going on with my characters that I wander off on leafy byways, linger by unimportant mudholes and come up with unecessary complication after unecessary complication. I find myself adding minor characters when I'm more than halfway through, thus irritating my antagonist and protagonist who just want to get to the end of story.
I study books that have both a simple plot line and lots of emotional appeal. I applaud them. But when I try to produce something straightforward, little by little those complications creep in.
Curiousity can be both a good and a bad trait. In real life and in my writing life, I'm afraid I've been either cursed or gifted by snoopy christening fairy who hopped through the window when nobody was looking and handed me a double dip.