2003 Saturn L300 Won't idle down

2003 SATURN L300
161,616 MILES • 3.0L • V6 • FWD • AUTOMATIC
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CLEMONS
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I have a 03 Saturn L300 just replaced the ECM. Completed the relearn for it but it won't idle below 3500RPM .
I have replaced throttle body and accelerator petal and tried to relearn them but same problem. The only code I have is PO1780. Any suggestions ?
Sep 11, 2015 at 11:14 AM
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SATURNTECH9
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So is the throttle plate open its idling that high?if not you have a big vacuum leak somewhere.
Sep 11, 2015 at 12:28 PM
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SATURNTECH9
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Also how did you learn the ecm and the new throttle body? Also your sure you only have the code p1780?
Sep 11, 2015 at 12:33 PM
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