2002 qx4 p0507 and p1491 now p0506

[macdole99]

hey guys i have a question i was driving and came to a stop and the truck started bucking and shutting off i managed to drive it home( 2 hrs) and it ran fine except for when i had to come to a stop, where i had to brake and gas at the same time to keep rpm up. i looked on the site decided to change the iacv and clean the throttle body. now when cold it cant hold start or after it warms up it idles at 250 rpm. and now the code is p0506 i have tried the relearn like 10 times and it wont work. i took out the computer and it looks fine no indication of damage. im stumped as to what it could be. any ideas? thanks

[Hbaleygson]

Try adjusting the TPS. You'll need feeler gauges and a continuity tester. Instructions are in the service manual. Or the iacv damaged the ecm.