Re: Website not being indexed...

I'm tempted to completly remove my google sitemap.
I have 2 websites running, the one with no sitemap is appearing on
first page of google, the one i've done a sitemap for has been dropping
off the SERPS for the last 3 months and is now virtually non existant!
Both sites show up on the first page on Yahoo and MSN searches.
Is it a good / bad idea to remove my sitemap?