Q I'm troubled with a rough-rnning engine at 7,000 feet and higher. The engine is a Continental TSIO-360. I put in a new electrical harness, had both mags rebuilt and put in new spark plugs. All the work was done by a certified A&P. How can I solve this problem?rnA Ignition systems aren't usually associated with altitude-related problems. In any case, it sounds like you've just about eliminated the engine ignition system as being responsible. I would consider the fuel system the most likely culprit. Check your fuel flow and make sure that it's maintaining the appropriate range through different altitudes. If not, there can be many causes, and the fuel supply system will have to be thoroughly investigated. Other than that, with the information you've provided, I suspect you may need to pay attention to your fuel mixture at altitude. An engine like yours can require some leaning at altitude to eliminate roughness. Some engine experts say leaning to the peak side of EGT cures this kind of problem. But be cautious: Leaning can also cause heat damage. You should call the engine manufacturer's service line and talk to an expert about how to properly lean out your engine to prevent it from running rough at altitude. They know best. I wouldn't experiment with this on my own.
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