One problem related to engine noise has been reported for the 1997 GMC Sierra. The most recently reported issues are listed below.
The engine rod bearings started making noise at 80,000 miles. The noise progressivly got worse so I was advised to run a 15w-40 oil and run the motor to failure. Gm gave me a price of $2500 for engine replacement saying it would be very costly to just replace rod bearings and the warranty on the new motor was better. As far as the steering problem, the truck started to under-steer at about 4500 miles. As you enter a turn (left or right) sometimes the truck just dives in that dirction and you must compensate in the other direction. It has gotten so bad that I am the only one who drives the truck. A friend of mine has a 97 chevy truck and had the same problem, he had it repaired for the sum of $1000.