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Q: 2003 Mitsubish Eclpise idle/stall?
on 2000 Mitsubishi Eclipse

2003 Mitsubish Eclpise idle/stall?
I have a 2003 Mit Eclipse RS. Car started stalling during deceleration and stop signs. Only would happen while foot not on accelerator. Took to mechanic. Got 2 Codes. Misfire and Bad O2 Sensor.
Mechanic suggested follow the misfire. Replaced all plugs, electrical box, wires, tune up, oil change $360 later did same thing. Next got second opinion. That mechanic cleaned throttle body and IAC. $120 dollars later same problem. Finally, took to Mitsubishi. They suggested follow the computer and replace O2 Sensor. $175 later still idles poor. Feels like gonna stall but doesn't. Don't know what to do or where to take. Had it smoked scanned for vacuum leaks found nothing. Everyone treating symptoms not some tricky cause. Read that only other cause could be small hose that you can only tell is bad when its opened up but seems like long shot.
Anyone have/fixed problem like this please let me know.
(Since 02 sensor change runs better untill A/C turned on
and SES light has come back on)
Please help!!!!
Thanks, Sky
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Two possibilities I can think of are: Possible vacuum leak. A hose has failed and cracked open or come loose causing a leak. There are multiple hoses to cause this issue but the main culprit is usually the breather from the PCV. The elbows are susceptible to wear causing cracks, holes or failure causing them to "suck themselves shut". Other is an EGR valve failure. Either of these issues will cause rough idle and stalling as well as tripping an O2 sensor. Hope this helps you. Get new code read and post that as well.
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