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are u sure ecu is dropping out?
if car just misses/backfires under load + boost, but ecu is still working, i believe speedo will still be working.(tach might drop because motor rpm is actually dropping like a rock) i had several problems that made similar problems.
maf wiring was bad..caused leaned out condition occasionally, misfireing bla blah.
maf went bad, anything above .7bar boost left me backfiring.
and on initial shakedown of car...car would miss so bad motor would stall under load+boost. this was combination of a small boost leak + too retarded timing,(used a timing light that was stuck on 5 degress retarded). stupid light><.
only way i really noticed that my ignition timing was crappy was lack of below 3k power and excess heat buildup. oh, and occasional backfire on deceleration
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