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ok, that's not limp mode, at least not what i've experienced. when i had a bad MAF and the ecu decided that it couldn't trust it, i got a cel and limp mode - limp mode felt like the engine was lugging or surging over about 4000 rpm - the ecu uses the throttle position to set fueling.
what you have sounds like no gas - fuel filter? fuel pressure regulator? start drawing lots of fuel at high rpm and crud plugs filter and engine dies. or fpr not regulating fuel pressure. if it happens fast enough car may not throw a code. meebe just a matter of checking vacuum fitting to fpr.
also, there was a person on here that was having something similar with a flash from ecu doctors and it was a screw up in programming the rev limiter. probably not your thing, however, as you've been running w this flash for a while.
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