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**Raylo** · 08-23-2008, 04:10 PM

20 sounds like a solid vacuum. The IAC is actually a stepper motor and will not move easily. That is normal. Yes, the vac line from below the TB goes to the purge valve for the evap system.

One wild shot I have read about over in the s10 forum is worn out distributors causing problems. But I think that would take many, many miles... and perhaps some bad oil change habits.

Depending on $ you might just change out the IAC, TPS, and O2 sensors. But if you can find someone with TTS Datamaster software you can watch the action of these devices and perhaps narrow it down a bit first.

Sorry, you've pretty much got me stumped. Maybe some of the TSF regulars can help?

08-23-2008, 04:10 PM	#16 (permalink)
Raylo TSF Enthusiast Join Date: Feb 2006 Location: Maryland, USA Posts: 521 OS: XP Desktop, Vista HP Notebook, XP Notebook	Re: 94 chevy s10 4.3 v6 problems 20 sounds like a solid vacuum. The IAC is actually a stepper motor and will not move easily. That is normal. Yes, the vac line from below the TB goes to the purge valve for the evap system. One wild shot I have read about over in the s10 forum is worn out distributors causing problems. But I think that would take many, many miles... and perhaps some bad oil change habits. Depending on $ you might just change out the IAC, TPS, and O2 sensors. But if you can find someone with TTS Datamaster software you can watch the action of these devices and perhaps narrow it down a bit first. Sorry, you've pretty much got me stumped. Maybe some of the TSF regulars can help?