Car Model: 2000 GMC Yukon XL 1500 Location:Comanche, OKSubmitted on July 8, 2012
wayne Comanche, OK
5.7 vortec idle is very erratic disconnected throttle position sensor and idle air control, idles and runs fine, replaced both no change. Only codes are random miss fire and vacuum leak at fuel tank, have checked entire vacuum system can not find a leak, replace fuel cap also. Any ideas email@example.com
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Eugene Franklin, MA
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Look at the mass airflow sensor or the map sensor both will cause the running issue you have talked about. It depends if the code is a lean code or a evap leak code to give any further info
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