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I found this guy with the same exact problem... 99 GMC Yukon stuttering My 99 Gmc Yukon SLT 4x4 4 door with 5.7L v8 Vortec and 4L60E auto tranny with electric 4wd selector, has a problem. It runs fine when you start it up and for the first few miles, then the engine will not go over 1200...

Hello everyone, Very nice forum you have here. I have a 1999 Yukon Denalli 5.7 4x4. over the weekend it started running bad like it is starving for fule when throtle is applied. It works fine at an idle. I replaced the fuel filter and it did not help. I replaced the fuel pump about 2 years ago...