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

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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.
(1) Answer
(2) Comments
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.