Discussion Starter · #1 ·
I have a 1999 Gmc suburban with a 5.7l. When im driving on the highway going up a hill just as i get to the top i feel a bang!!!! I took it in to have it checked out and they said it was the EGR valve. I replaced that and it still did it. The truck has 123000 miles on it. I dont know if its still the stock trans or not. Any ideas??????