8th Jan 2013, 00:31

Had the same problem; rough idle and hard start. It was my fuel pressure regulator. If you pull the little hose off and gas comes out, then you need to replace the fuel regulator. This is for the 4.8 2000 GMC extended cab 4 door.

26th Jan 2013, 21:37

With the clunk issue, take the drive shaft down from the rear end, then haul it back out of the transfer case, and by hand, grease everything. It removed the clunk in my 2000 Z71 SLE after a few drives around town.

3rd Apr 2013, 13:52

I am curious whether you still have the truck, and what happened to your oil pressure?

7th Jun 2013, 12:59

Man, all I can say is the rear end in a 1500 is junk. They won't hold up. Every truck I've had, the rear end has went out. I've had 3 of them, and one of them I put 4 rear ends in it; they just won't hold up. Try a single trac rear end.

19th Apr 2014, 18:48

My 99 GMC Sierra does the same thing usually only in 4th gear. Did you ever figure out what it was?

22nd Oct 2014, 21:10

Well all I can say is most people don't service their trucks. What I'm saying is a lot of people buy used trucks and never know what they have been through or how they were taken care of before they got them.

Yes, all the 5.3s have their noise, and some have a lot of oil pressure problems. I have a 99 GMC, bought it in 02, and I knew the guy that owned it. Plus I know how to work on most everything they make.

It had 74,000 when I got it. Now it's pushing 300,000, and it has been in three wrecks.

The transmission filter fell out after being on too rough a road, and it was the short filter instead of the long one it needed. Drove it 60 miles with the filter out of place before finding the problem. The transmission still works good, and the motor has almost stopped making a noise, and all I have ever changed on it is the water pump and radiator, and a couple batteries.

Oh yeah boys, I have driven it like I stole it. It has plenty of power, but the key word is maintenance; something I believe in.

OK, with that said, I also have a 2000 GMC. Both Sierras 1500s. This one had a lift kit and big tires, and I didn't know how it was treated. I have had it for over two years now, and have had a lot of trouble with it, because it was treated badly before I got it. So you never know; I'm just glad I know how to work on them and save a dollar.

I will say I'm old school. I don't like not having a disturber, and I sure don't like the oil pump placing, but other than that, they're good trucks as long as you take care of them. Heck I'm sure I'll get close to 400000 out of my 99. Y'all have fun now.

Oh yeah, one more thing, my little 99 has dusted plenty of found on the road dead in its day. LOL. Oops, my bad, stirring the pot.