What grade fuel are you running? I haven't experienced this in my 240 but an Integra i had did the same thing when i ran low octane fuel in it. But if i ran 93 octane it wouldn't do it. So if your running the cheaper stuff it's a possibility it could be causing it. Try filling your tank with 93 octane and running a bottle of fuel injector cleaner through it. Solved it in my Honda.
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