I had a diagnostic test done on the Jeep today and found that the vacume leak is at the intake manifold gasket. I've never done this job before but usually tackle most reasonable stuff. The local shop wants $400.00 to do the job but the gasket is only $30.00 so I can't possible justify the labor if I have the time. Is there anything that I should know about before tackling this project? Any suggestions would be greatful. Thanks.