I don't know if this is the right forum, but I couldn't find any newsgroups that my ISP carries for GMC trucks. I have also googled for the problem I am having and have not been able to find it.
I have a year 2000 GMC Sierra 1500 pickup 6.5 foot bed, 4.8 liter engine,
4X4 with 92000 miles on it. Recently, I began having problems starting it. When I turn the key, instead of it starting right up, it sounds like it is starting but then stalls. I took it to my mechanic and he suggested possibly it was the plugs and so we replaced the plugs and the fuel filter. He said that the plugs he took out were not platinum tipped. I had bought platinum tipped plugs per his advice and he installed those. I am still having the same problem. What is really strange (or a really big clue as to what is going on) is that, first thing in the morning, when the engine is cold, it starts right up. no problem. As the day goes on, and I use it more, it gets more difficult to start it. To the point where I have to boot the gas pedal as I turn the key to get it started and then it idles really low (around 500rpm) till I shift into gear and get rolling. Once it gets going, it seems fine, no stalling, no problems. Has anyone had any problem like this? or heard of a solution to a problem similar to this with these trucks? Or if anyone knows of a more appropriate forum I could post my question to, pls advise.TIA, Joe