is simple-sitemaps harmful to google rank

Hi,

I'm wondering if this plugin is actually harmful to your google rank?

If I have a lot of splogs, will google et al treat my entire site as spam?

If I delete the plugin can I delete the resulting sitemap as well, and if so where and how?

I'm having a lot of SEO issues at the moment.

My site was high up on Google for a number of search terms and now it gone completely, it think because of the recent changes to Google's algorithm.

Thanks for you help

Ralf