93 Chevy 5.7L- Curb Idle Test:ALL EMISSIONS PASS, @Test Speed: aprx.1300rpm HC fail,

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engine surges,E-test Fail? Curb Idle Fine: ALL EMISSIONS PASS

but at TEST SPEED approx 1300rpm HC (hydrocarbons) fail reading 205 & limit is 73 also engine surges/chugs at that speed.

All plugs & wires & cap & rotor have been replaced.
 
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