My 2002 Mitsubishi Lancer Oz Rally runs beautifully until it is idling at a light or parked. When fuel is applied even when resting it stops running poorly. The guy i bought it from said the fuel pump gets clogged, i have theorized it may be the fuel pump being clogged.
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@emoboyscheming a clogged fuel pump would not supply the larger amount of fuel needed when you rev the engine. It would get worse. This sounds more like an Idle air control valve problem (or failing throttle position sensor) possibly some carbon buildup. Get some throttle cleaner and clean it out. There are plenty of other issues that could be causing it. I would get the OBD scanned to see what codes show up. Not all of them would trigger the check engine light. Let us know what you find out.
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I have a 2003 Lancer ES. I had the same problem. In my case the cause was an after market MAF sensor.
I replaced it with a used genuine part from eBay and the problem did not come back.
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