Hi. I'm about to replace valve-cover gaskets (2) because I have a noticeable leak. I think I'll also replace the plugs since I have 92K miles on my car. What vapor hoses are apt to need replacing on this job? Since I'm buying parts to take to my mechanic I'd rather be prepared - it's over a 2-hour job and I don't want someone later to tell me I need a vapor fuel hose too. Comments welcomed. Thanks!