Hi all, I'd a site with pr2 and I used AdWords to advertise it and after few months, I've stopped using it. 1 week after stop using adwords, the pagerank became 0 Is it possible the pr 0 to be a reason of my decision to stop adwords ?
Nope. The PageRank you can see in the toolbar and checkers lags behind the PR google is using, there's no connection between PR and adwords, and google really have got better things to do with their time than to go round manually altering the PageRank of adwords users.
I very much doubt it. Have you noticed a change of positioning in the SERPs and referrals from Google after the loss of toolbar PR? I don't suppose that you've been selling links on your site have you, as that would account for the loss of toolbar PR.
Page rank got nothing to do with your adwords. Maybe, you giving out too much outgoing links with passing page rank juices (dofollow links). Maybe, you don't make enough backlinks that is dofollow link to your site. Or, you might have abuse google policy by selling links with dofollow link on your site with text link ads or paid posts. If you could let me know your site, I can check it for you.
yes, there is no connection between adwords and PR. Better you try to bring quality relevant backlinks to your site.