Hi cartool0, welcome to the forums,
First, for me is the white text on a black background. I've seen this on "Game" and "Goth" sites, but these type of sites are a younger demographic than auto tools. So I'd have to really be interested before struggling to read it, in fact, I turned off CSS styles to do so. Not something most visitors are likely to do if a back button's handy.
I looked for the link to the forum to see how many registered members it had, but could not find the link. Try making it more visible. EDIT: Found it. In addiition to being inline in the text, another link to it might help. 0 members? Not good but then again it's only a month old, give it time.
As for lack of sales, I don't need to tell you that in the current economy money is tight. And from what I remember of the area, the northern border of Vermont isn't exactly heavily populated. Maybe highlight your shipping terms?
And I think maybe a "weekly/daily tip/tool/common problem" type of blog would help attract visitors too. You could get WordPress for free if you wanted to.
If you're prepared for a potentially brutal but honest evalution of the site, try posting a thread in the "site review" forum. http://www.sitepoint.com/forums/forumdisplay.php?f=12 Just need to comment on 3 other sites first before starting your own thread.