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I have an 89 240sx and had the same problem. After replacing the air filter, tune ups, and the fuel filter, i still had no luck. Then i checked the connectors on top of the fuel injectors and found them extremely corroded, I cleaned them and it has almost fixed the problem. To fix completely you need to get new ones if they are corroded, and maybe even some fuel injectors.

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Q: What causes power loss hesitation on a 240sx 1.8T at 4500 to 600 rpm problem is worse when cold and full throttle?
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