Still Rough Idle After Battery Disconnect

Disconnect your battery, wait 30 minutes, then reconnect and drive for 30 minutes...

stop the car and turn it off and don't forget to remove the key. the open the hood and find the battery. Then remove the negative battery terminal connector completely from the battery. with the battery disconnected turn on you headlamps as you would for night time driving. Wait an half an hour so all the current drains out the the electrical system. after the half hour TURN OFF THE HEADLAMPS BEFORE RECONNECTING THE BATTERY! Next reconnect the negative battery terminal connector back on the negative battery terminal don't forget to tighten it down. Put the key in the ignition turn the computer on to on BUT wait 5 seconds before actually starting the car, then start the car as normal and drive the car at least 25 miles 10 city 15 highway so the car can relearn all it functions again **Note first time start the car my be rough due that it need to relearn if it is acting rough apron start up let it idle for a bit before driving so it can calm down**

Pull the connections on the battery and leave it disconnected for 10 minutes. Reconnect and test.

By chance, did it start idling rough while you had the defroster on, or the A/C? This is a very common problem after the battery is disconnected AND the defroster or the A/C is on. The defroster uses the A/C to dry the air. To fix this, spend about $7 on a can of throttle body cleaner. Disconnect your battery again, and clean your throttle body. After finished, reconnect the battery and drive for about 5 miles with the defroster or A/C off, this will allow the computer to reset and relearn the newly cleaned throttle body. When you changed your battery, you computer reset and thought the throttle body was clean, therefore you get rough idling when the defroster or A/C is on.

double check that you didnt disconnect or break a wire while cleaning battery, clean throttle body,

Clean throttle body first, make sure you disconnect battery foe about 30 minutes so PCM can relearn to cleaned throttle body.

Have the Idle Control Solenoid Valve cleaned up.

Or it might be defective. See steps below to check...

1. Disconnect idle control solenoid valve electrical connector.
2. Disconnect upper hose to solenoid valve from manifold and apply vacuum to hose. Valve should hold vacuum.
3. Continue applying vacuum to hose and briefly energize valve by connecting battery positive terminal to the black/yellow wire terminal and negative battery terminal to the green/black wire terminal. Valve should not hold vacuum when energized.
4. If idle control solenoid valve fails to perform as outlined, valve is defective.

Disconnect the battery again for a few minutes and then reconnect. This will reset the adaptive memory.

The throttle body needs cleaning. It has some carbon build up, and when the battery went dead the computer lost its learned values, one of which is base throttle position. Now its reset back to factory specs, not accounting for a dirty throttle body. Seen it a million times