Hi fellas! I've done oil pumps on a lot of cars over the years, but this is the first time that I feel the need to replace it in my 2002 4.3 Silverado, and I just don't know where is it. By the way, and before I get to it. I would like a few opinions from you guys with the experience or should I say expertise? The engine makes a clunking noise like oil starvation usually in the morning or after the truck is been sitting for a few hours. I just noticed that tha oil pressure gage moves very slowly up while the noise is there and it takes a good 3 to 5 minutes to reach the max which is two lines over the 40 mark. Am I right to suspect the oil pump??? Or should I look for another offender?