Behind the grill
45 mm
When making any changes to a car, it is important to have a diagram for a guide. A diagram for a 1987 GMC Jimmy vacuum hose system can be found in its manual.
what is it that you need to know about it?, I have a 1989 GMC Jimmy 4.3L, if the system is the same then I can help a bit, doing some work on it at the moment, replacing the pump.
http://wiki.answers.com/Q/Where_is_the_idle_screw_on_a_1987_GMC_jimmy_5.7_liter"
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