07-11-2006, 04:20 PM
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Senior Club Cobra Member
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Join Date: Mar 2000
Location: St. Augustine,
FL
Cobra Make, Engine: E-M / Power Performance / 521 stroker / Holley HP EFI
Posts: 1,935
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Not Ranked
Yo Ray,
Nine times outta ten it's an exhaust leak. Extra oxygen gets into the exhaust flow somewhere after the exhaust port and mixes with the unburned fuel. Happens on deceleration. BOOM!
Figure out where it is leaking and tighten or replace the gasket as required. I always try tightening first (don't overdo and break something off).
Seems to be a common Cobra disease caused by vibration and heat 
Tom
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Wells's law of engine size: If it matters what gear you're in, the engine's too small!
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