dtc code #1638 on my 2002 chevy p/u 6 ltr.motor computer came up.The check engine light has not come on.The idle is erratic @cold start(revs high than realy low) than goes away in about 15-20 seconds,it will stall if I do not feather the gas pedal. any ideas? Not even the dealer can tell me what exactly the code stands for. (Optional Information: 2002 Chevrolet 1500HD 6ltr.K&N filtercharger installed.Reprogramed computer w-hypertech power programer,aftermarket alternater.These components have been on the truck for atleast 2 years and this problem just started about 3 weeks ago.
Edited by Customer (name blocked for privacy) on December 24 2005 at 9:42am
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