87 Suburban run rich at idle

[cboyd1]

I just got a 1987 GMC Suburban with 103k on it.
It seems to be very rich at idle, but runs great once you get moving. I tackled a few things right away trying to eliminate the problem.

Here is what has been done to: (It was running rich before I did any of this)

-Ultimate TBI Mod with TBI and POD Spacer - throttle body was completely cleaned at this point.
-open air filter
-complete tune up
-fuel filter
-O2 sensor
-coolant temp sensor
-removed converter

This added quite a bit of power back and improved idle quite a bit. It seems to be running very rich at idle and occasionally has a high idle. I am not sure what to look for next. I checked for vacuum leaks, swapped out the IAC motor as well.

Any help or pointer would be great.
Thanks

 

[cboyd1]

Anyone?

 

[magik235]

Have you explored WINALDL at http://winaldl.joby.se/ ? I found the program useful in solving my issues. Two of the screens are shown below.

 

[wazzabie]

Have you explored WINALDL at http://winaldl.joby.se/ ? I found the program useful in solving my issues. Two of the screens are shown below.

looks like a cool application. What was the problem that you solved with the software?

 

[magik235]

The problems I was having are outlined on page 2 of my build thread. Click on the link below for details. The entries start on 6/9/10.

http://coloradok5.com/forums/showthread.php?t=278655&page=2