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Q: Why does my car stammer when idleing...sounds as if it wants to choke out on me. on 2004 Mitsubishi Diamante

My 2004 Mitsubishi Diamante stammers while idling as if it wants to jump timing . It especially loves to do it while I am stuck in traffic or at stop light (especially when brakes are applied). I sometimes put the car in neutral while waiting in traffic and rev it up a little. I am also noticing a slight smell(like burning rubber) inside vehicle. Error code auto zone said #3 spark plug.
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You could indeed be experiencing a misfire from cylinder number 3, not necessarily a failed spark plug, but possibly a coil or other cylinder issue. It's a good place to start checking, but a code puller from a parts store only gives you a fraction of the story. Manual testing is needed to see what is actually happening, not to mention looking at a data stream of information from the engine's computer.
Since my car is no longer under warranty, where should I take it to have it tested I do not trust my dealership. They told me I needed a power steering flush, transmission flush, engine flush...sounds more like a wallet flush to me. I have always had regular oil changes, I don't understand why I would need an engine flush. Easy money maker for dealership I think.
Try the RepairPal directory. Use the button at the top of the page and find some shops near you that work on Mitsubishi cars. It's tough finding a place you are comfortable with, no doubt. But it's a good place to start.

Dealerships are the same way - some are compelling, and some (as your story goes) are not. Flush, Flush, Flush is really evidence of a poorly educated service department. Sure, I could explain the features and benefits of all the services, but you couldn't possibly need them all at once. At the appropriate times, a transmission flush, brake fluid flush and even a power steering flush are not bad ideas. The engine flush...well... no.
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