Car dieing when put under load

[Don.F.Broadus at ucm.com]

The IAC on my 88 GMC gets clogged up with EGR induced products. I have to
give it a good shot of gumout carb cleaner to free it 
 up. I had the  same derivability problems you describe. 








> -----Original Message-----
> From:	David Mulvey [SMTP:kd6bzn at QNET.COM]
> Sent:	Monday, August 09, 1999 10:25 AM
> To:	gmecm at efi332.eng.ohio-state.edu
> Subject:	Re: Car dieing when put under load
> 
> Date sent:      	Mon, 9 Aug 1999 08:51:50 -0500 (CDT)
> From:           	Roger Heflin  <rah at horizon.hit.net>
> To:             	GMECM <gmecm at efi332.eng.ohio-state.edu>
> Subject:        	Car dieing when put under load
> Send reply to:  	gmecm at efi332.eng.ohio-state.edu
> 
> > My car is dieing at idle when I put it under load (A4, put it in gear or
> > turn on A/C).   It just started this recently, and nothing has been
> > changed on the car in alsmost a year.  Once in a while it will die at
> idel
> > without a load, but I have stopped that by adjusting the throttle set
> > screw so it gets enough air to not die at idle.
> 
> Sounds like the IAC to me.  When the IAC count changes does the RPMs
> change also?  if not then the IAC is stuck, dirty or just broken. 
>  
> My car would die while backing out of the driveway and hitting the brakes.
> It would die while trying to stop going backwards.  A new 
> IAC fixed it and also gave the computer control of the idle again.  Keep
> in mind when you do change the IAC, you have to set the idle 
> down to almost 0 RPM, then the computer will take over.  Then you have to
> set the TPS with a volt meter. Most manuals will tell how..
> 
> David Mulvey
> Lancaster, CA 
> 87 IROC 5.0