GMC envoy 4.2 2002
I6 sometimes cranks a few times before it starts then runs fine idle a lil rough
occasionally and sometimes tries to die while idling no check engine light I'm
thinking vacuum hose sensor or pcv valve
On these vehicles it's usually a dirty throttle plate. As weird as it sounds a dirty throttle body causes it to stall when or when the AC isn't on. What you have to do is remove the intake and get to the throttle body, remove 4 10 mm nuts and the wiring that controls the motor in the throttle body, then remove the throttle body. For this use a spray made for throttle bodies and nothing else since it's an electronic throttle body. Clean it with a rag then install the throttle body back on and just snug up the nuts, you don't wanna strip them.
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