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That is usually the cause in Z's. I haven't seen it happen to many 240's but its possible. My 91 does this as well, it comes close to dieing. My problem is my MAF adapter is shot so it gets a week signal. You might want to check that, then take a look in the Archive & FAQ section for the AIV valve, your problem could be caused by it being clogged. If those don't work, try to figure out a way to get rid of the turbulence that your intake has to deal with at high speeds.
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