Hey guys. My car has been sitting for a while yet I turn it on and let it run until it's fully warmed up in every 3-4 days. At my last start up, I realized, the RPMs hang and go down very slowly when I rev it. Say I rev up to 5000, it will stay there a couple seconds and go down very slowly. I get to bring it down by tapping on the revving intermittently. I am also a tad low on oil. Is that the reason or what?:dunno: Thanks in advance.