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That was my first guess a clogged cat so I had the cat tested by two different shops. The first checked by just how much it was flowing.He said it could be a number of things have to run some tests.The second checked the flow, the temperature before the cat and after.He said if there was a...

I have a problem with a glowing exhaust manifold. I have a 90 ranger 2.3 with about 300,00o mile on it. It started all of a sudden. I did the usual tune up stuff, plugs,wires, coils ,and ecm with no luck. I had the cat checked and there is no problem with it. What would cause this problem