If you don't have a gauge, some parts stores will rent the gauge or you can purchase one at the test equipment store site on this page.
Joe
Mar 10, 2009 at 3:18 PM
NITROJUNKI
MEMBER
1 POST
I may be too late on this but check the idle control valve. If replaced, be sure to reset computer by disconecting the batt for a few minutes. This resolved my problem with my 1500 ram 98