I have a 1999 GMC Yukon. The abs brake light comes on after about 5 minutes of driving then goes off and stays off when it the ignition is tuned off then back on. At the time the abs light comes on, my speedometer drops in speed but i do not lose speed. ECM has been replaced and same problem

SOURCE: I have a 1999 GMC Yukon Denali, 350 V8. I want to

check in the area above the rim of the oil filter...they're typically located very close to the filter.
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SOURCE: 1999 GMC Yukon seems to backfire once in a while

look for vac leak at egr valve, when cold spray carb cleaner on and see if it speeds up the eng

SOURCE: 1999 GMC Yukon - Blower only operates on high. I

on these models on the harness that plugs into the fan switch goes bad, I changed the switch and found this harness melted together on my 99 yukon

SOURCE: GMC Yukon - ABS light and parking brake light come on while drivi

try to pull up on your parking brake pedal with your hand when light comes on. if this makes it go out u will need to adjust the parking brake switch under the pedal. or replace pedal spring that holds it up.

SOURCE: 2007 GMC YUKON denali, rear brakes have an air

Here's a link to a thorough article on the subject which should help you...

http://www.aa1car.com/library/abs_bleeding.htm