I have a vac test kit. Where is the best place to hook it up to check the vac on my truck. It's a 91 F150 with the 4.9 300 I6. I don't want to have to cut a line if possible. I've got to figure out what's causing it to run so bad.

thanks in advance

 

somewhere off the intake manifold...maybe towards the back on the passenger side.

 

Is there a "vacuum tree" with perhaps one nipple capped that you could remove?

 

not for sure. I will have to check when I get home. What about at the EGR?

 

Yea, just cut the line and install a tee...sold at the auto parts...different sizes.