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Had such a situation once on my '86. Slow on acceleration ... wouldn't top more than 35mph. Idled fine, though.
Didn't think much of it, as it disappeared a couple days later.
Found out after failing smog that what had happeneed was the cat broke and lodged itself in the resonator. It stayed stuck until vibrations managed to break it down a bit more.
As it is, I've still got parts of the old cat in the exhaust system.
To find out, remove the test plug just in front of the cat. If the symptoms go away, it's a clogged/broken cat.
-- Kane
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Blossom II - '91 745Ti/M46 ... Bubbles - '74 144GL/BW35 ... Buttercup - '86 245GL/AW70 ... The Wayback Machine - '64 P220/M40
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