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Does anyone have any idea why my ka24de 240 is be misfiring
. Could be tps or coolant temp sensor leaky injector
Check your tps first and then change your coolant temp sensor
Disconnect injector 1 by 1 and see which cylinder has no change I say it could be an injector leaking
 

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I've had my 240sx since 1995, and anytime I've had a misfire, it's been the injectors.
Check the impedance on each of them. From what I just looked up again, each of them should be between 11-14 ohms.
 

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Start with spark plugs and work your way to the distributor and make sure all cylinders are firing. If spark checks out, check fuel system for any blown o-rings, leaks, etc.
 
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