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If you're running unleaded gas, the first suspect would be the catalytic converter, of course. Has it been gutted? Does it rattle when you beat on it (cold, of course)? Is your AIR system still in place (the air pump and lines on the exhaust manifolds)?
If you're running leaded gas, then the cat is likely dead, and needs replacing. Cats and lead don't get along.
A car that's in proper tune (good plugs, good wires, good catalytic converter) should fare just fine on the HC test.
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