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Originally Posted by nistech
try using 87 see what happens it is most likely detonation cuz u use high octane gas
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Uh...93 octane gas won't cause detonation unless you have a deisel. Detonation occurs when you have too low an octane. Nissan recommends 91 octane in all 240s so 93 octane isn't going to hurt it or really help it all that much either. Maybe a little more power but not noticable in the cockpit. 87 octane will likely make the problem worse.
You have a vacuum leak for starters. That's why you have an erratic idle. Also your acceleration problem sounds like a slipping clutch. Let me guess....have you been dropping the car into gear at about 3-5 rpms??? Even for just one night? Cmon be honest....it's too tempting not to right? I'm sure that's your problem, bad clutch will slip the heavier the load gets. More rpms = heavier load = more slippage. Time for a new clutch kit.