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disconecting batt resets the computer. now it needs to learn how to set everything to run again. disconnect batt for atleast 60 seconds, re atach, start car it will start and die(dont press gas) do this over and over until it idles (could take up to 10 times). by pressing the gas you make the computer think it is idling to high so it keeps turning down the idle. it will idle fine after reseting computer and starting several times without hitting gas peddle.
first ensure your spark plugs, wires, cap and rotor/coil packs are in good shape. once thats done check for a check engine light, sometimes they come on then go off but a code will be stored regardless. once you have made sure your getting good spark and there are no trouble codes the issue is most likely a dirty throttle body or fault IAC (idle air control) valve or throttle positioning sensor. hope this helps, good luck
When the car ran out of gas it may have tried to run on no fuel and retuned it self to attemp it. You may have to dissconnect the battery so the car can retune itself. When starting the car after reconnecting the battery. hold the engine speed higher than idle and turn every thing on. continue to run the car at the fast idle for a minute still holding the idleup a little put the car in drive holding to break and slowly let it idel down this will relearn the idle and should fix the problem
Sounds like it needs to go through a drive cycle. After the computer has been deprived of power for ten or fifteen minutes, it will need to relearn the paramiters of the electronics for the engine. Take it on a 10-15 mile drive with out stops (the high way) at about 55-65 mph and it should be ok. If not you may other problems.
What you have is PROBABLY a bad Idle Air Control stepper motor... if the car stays running with your foot on the gas, and only dies when you let your foot OFF the gas... or if it dies when you shift (again, cause you foot is off the gas) that is definitely the problem. The stepper motors are kind of pricey (over $300) at the dealership, but you should be able to get one from an auto parts store for 150 or so. easy as heck to replace, it has three 8MM bolts into the throttle body, just unplug it, unscrew the bolts, and put the new one in... just be sure to be careful with the new o-ring... DON'T LOSE IT! :)