Having problems with your 2003 Chevrolet Impala ?

2003 impala intermittent high idle with high iac count iac tested good

\015 It was setting a po 121 it has a new tps and all circuits tested good but some set the base idle up so i reset it back to make the tps fall within proper voltage range i then started the car it idled at 2000 rpm with hi iac counts and hi tps readings then all of a suddenit set po 121 and all the sensor readings went normal and idle went 750 went in scanner menu and cleared code with car running and again 2000 rpm idle with iac count of 77 at this point i turned it off but no 121 had set yet atthis point im thinking computer all other sensors appear to be functioning normally anyone have any ideas\015 Posted / edited by AnonymousUser on : 14-10-2019

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Repair Help & Product Troubleshooting for 2003 Chevrolet Impala

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