After getting p1506 overspeed code. Replaced iac and still have higher than spec idle ( 1100 + - ) and restarted the truck after disconnecting the battery and code is gone but high idle is still about 1100. Anyone have an idea what iam missing checked some of the top side vac hoses and they seem good.
i THINK its a vacum leak, hard to hear the spot. replaced the IAC hoping that was it. base idle should be 780 in nuetral. idles at 1100 nuetral,750-800 in gear and lower with air - point me in the right direction pls. ever had the same type problem yourself ?
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