[Gmecm] creepy idle

[Andrew Gibson]

Steve it sounds like a load issue. Since it idles like it should in neutral but not drive, even with the bad prndl switch, you need to be looking at the precived engine load aka MAP, a/c input, etc. Anything that would make the ecm want to go higher on the idle. This alone shouldn't be an issue though.
   
  With an auto trans the IAC shouldn't be over 50 at 750 rpm. Check the stall speed on your torque converter. It may have balloned and reduced the stall speed thereby making it impossible to attain 737 rpm in drive or any gear for that matter.
   
  Good luck!

		
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