sleeping stallion

ok i just put my new tb and plenum from bbk it runs good the throttle response is alot alot better
i went with a 75mm bbk tb and plenum.. but now my problem is that before my car use to idle at around 500 or so some say it was low but it ran great. but now its ideling at around 800 and depends if its in d or p or n it idels from 800 to like 1k.
so when im driving and i let off the gas, the rpms stay the same for about 2 or 3 seconds then it drops and starts to slow down. can anyone help me with this. i dont no if im explaining in detail but hope someone can help me

tim2002gt

Give it a couple hundred miles or so to adjust. Mine took about a week of driving before it fixed itself. If it doesn't correct itself, then possibly the throttle position sensor may need to be adjusted. There isn't much to adjust, but sometimes you can loosen the screws a little and turn it a very small amount left or right.

Chubstang

you could try re-setting the battery so the pcm can re-learn with the tb.

sleeping stallion

oh ok so this is normal then thanks. and how would i readjust the sensor im gonna disconnect the battery and leave it for a acouple days see if it adjust