How do you turn up the idle on a 4.3 liter 86 jimmy?

Answer 1

EGR is an excellent place to start, as is the IAC motor and passages. When the motor is running the computer should be setting the idle to around 700 or so, although it can only bring the idle UP, it cannot lower it past the minimum as determined by the setting on the TB. If the IAC (Idle Air Control) motor is not functioning, or clogged up the idle will be erratic and the vehicle can sometimes stall. Personally I would pull the TB and clean the SNOT out of it, and clean the pintle on the IAC at the same time. I would also clean the EGR valve and passages at the same time. If the truck still idles low then I would go through the process of setting the minimum idle manually.