I have an ASP .52 that runs great, good power, good idle but if I leave it in the mid range for awhile then punch it to WOT it automatically dies. How do I fix this or is it normal?

Here's a review on ASP 52 the by one of the most knowledgeable RC writers. The second page recognizes your problem and how to deal with it. (#7 OS plug) But read the whole review.

http://www.rcmodelreviews.com/asp52_review.shtml