1999 5

  • 152,000 MILES

1999 5.3 4wd auto. Engine idle fluctuates 500 rpm to 800 installed MAF ran good light stayed on for a long time then went out. In the morning wouldnt idle, was ok when warmed up then it started fluctuating agian sometimes between 500 and 1000 rpm then light came back on the code was P0104, P0174, PO102 and PO103.I replaced fuel filter, and fuel regulator. Truck does not stumble, lots of power runs great except for Idle. I disconnected the battery for 30 minutes when hooked up it was ok then next day started again so I disconnected battery again but this time, no change it started to fluctuate rihgt away. I checked for vacumn leaks the old way while engine was running I sprayed starter fluid around vacumn hoses to see if engine speed up but not much responce so I figure hoses are ok. Is it possible to check all the other sensors rather than replacing them all one by one. I am a good mechanical trouble shooter but with all these sensors Im lost. I need directions

Wednesday, February 13th, 2013 AT 7:41 PM

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