Trailer-itis fix for bogging getting up on the trailer 1991 to early '93 60° V-6s
Drill out calibration hole in intake manifold to richen up the off-idle mode. This is only on early 1993 and older V6 60° engines without adjustable idle mixture screws.
Use caution when removing the core plug as it is very easy to damage the intake manifold and calibration pocket if you are careless or hammer-fisted.
Drill a small hole the center with a drill bit and use a pin punch to pop out the core plug. Do not let the drill or punch go too deep once through the core plug. Once again, use extreme care.
Last edited by SEAHORSE; 07-18-2016 at 07:28 PM.