93 mazda 626 v6 engine problems? ?

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I have a mazda 626 with a weird problem. It runs fine when first started, lots of power, etc. After about 4 mins, sometimes less, though, it runs really crappy, has no power and bogs really bad when you step on the gas too fast. It wastes enormous amounts of gas (only gets about 200 miles on a 13 gallon tank) and is driving me into the ground. Cat was replaced twice in the past year. whats wrong with it!? It has the KLZE swap from japan.
Check engine light was on due to the KLZE swap that I did but installed eprom to make the ecu j-spec last night and now the check engine light stays off or just flashes every once in a while, not sure why?
 
does check engine light come up?
what trouble diagnostic trouble codes have been received?

if check engine light doesn't come on, sounds like you have an excessively rich condition melting cat converter

need more information to help better
 
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