89 K3500 7.4 th400 with abs, just replaced the module when I got the
truck, abs does seem to be working. The problem is after the abs kicks
on the truck will start stumbling at idle, it doesn't stall but sounds
like it wants to. After I go at normal speed for a few
minutes(anywhere from 30mph on up) it goes away. The truck runs/idles
fine other than that, just had a tune up. Any ideas?