Below a link to the diagram you requested for a 1998 S-10 with a 4.3. Please feel free to post back with any questions. Best of luck.
Greg
Chevy S-10 Vacuum Diagram
If I understand your question, the line you're referring to starts at the EVAP cannister . It runs toward the back of the engine in between the end of the left valve cover and the air breather to the EVAP service port. That appears to be the only split vacuum line. The other lines should be direct to the PCV valve, Throttle body, EVAP purge solenoid, and the MAP sensor.
Here is another diagram that may better show what you're looking for.
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Have you checked under the hood,The vacuum diagram is posted on a big sticker.
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there is a vaccum line trhat goes from the intake up around the brake booster then splits off 2 ways one goes back behind the brake system the other disappears under it u know where those go i need to know where those are
one goes behind the abs and the other goes under i cant find them u have that diagram or know where i might look
this vacumm is coming off the idle air control with one line spitting at the abs one goes under the other goes behind
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