Cats glow red when there arew too many hydrocarbons trying to pass through them. manifolfds will glow red under a lean condition. sounds like a rich condition. too much fuel in the exhaust. suspect bad plugs/wires. o2 sensor. general bad running engine
It isn't a restriction. Cat's glow red when the engine is really lean or the timing is wrong.
Testimonial: "ok thanks for the info but the car is still shuddering thinking it might be the the o2 sensors leaning out the fuel around 12,4 or so instead of 14.7 "
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