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Whats wrong with my Mazda B2500?

I have a 2002 Mazda B2500 non-turbo . When you get to around 2800 rpm it mis-fires and throws smoke out of exhaust. It also has no power and is using around 3 times as much fuel . Any ideas??
Craig, May 2008
Maybe the valve that regulates fuel flow to catalytic converter is sticking.

PrincessLia, February 2009
blockage in exhaust sydtem?

andrew, May 2008
link Click here to see other fixes for Mazda.