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Hello Amy, not a POS, just has quirks like all vehicles do. It's a very good engine. I'm going to address the bad idle which is very common after the battery was disconnected for any reason. This is a job that you can do yourself for around $8. Remove fuses # 10 and # 28 under the hood, then remove the throttle body and clean both sides with a sensor safe spray like Seafoam. It's just 4 bolts and a electrical connector that it. This will solve your rough idle when every your AC or Defroster are on. The other lights, do they go off if you turn the car off and restart with the steering wheel pointing straight?
Apr 21, 2015 - When diagnosing an engine with a rough idle, there are certain things that must be ... If the problem does not reoccur, the codes will be erased by the computer. ... when accelerating the vehicle, which causes a higher fuel demand. .... it was water in gas...added added Gas LineAntifreeze/Water Remover.
If your battery warning light is on, then your alternator is NOT working okay. Rather, maybe the alternator DOES work, but the battery light can also come on if your battery won't charge.
Put a voltmeter to the battery terminals when the engine is running and rev the engine to a medium idle. Battery charging, (engine running) it should be about 13.5-14.5 volts. Engine off fully charged battery voltage should be 12.6 volts.
Quick test-engine running, disconnect the positive battery terminal from the battery- if the engine dies, there is still an alternator problem.
WEll it is possible it could be the idle air control. one the most comon problems is the fuel pressure regulator. To check it find the fuel rail the fuel regulator will have one vacuum hose on it remove the hose and check to see if it is wet with fuel if not have some one trun the key on or start the car if it leaks fuel out the regulator is bad. This would explain why its hard to start when it sits because it floods out the motor