The ABS module went out at about 80 M miles. Cost over $1000 to repair. Had to pull the fuse to keep from running the battery down. Should have been recalled and fixed by GMC, since most of the vehicles have had this problem. No recall.
Sticking gas pedal. After about 40 M miles, the gas pedal started sticking, just like it did on my 97 Safari van from GMC. Cost $300 to fix the safari, and I am just living with the problem on my 1999 Sierra pickup. No recall from GMC, although it is a common problem on many GMC vehicles. People at the GMC place said it was caused by low grade fuel.
Every time it sticks, it reminds me that I will never buy a GMC again. Thanks GMC for building in a constant reminder not to buy from you again.
I had this same problem. And yes it is due to the use of cheap grade gas over thousands and thousands of miles. It's due to carbonation sludge accumulating in the throttle chamber. Very simple solution - clean out the throttle chamber, located right where your throttle arm is. Very cheap to fix - you can do it yourself with a can of carb cleaner and a little bit of patience!
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