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take it to an autoparts store or dealer immediately and have them read the computer to see what if any codes it's throwing. Otherwise, you're going to foul you're plugs like crazy and not too mentioned burn out the expensive gas in there you shouldn't be.
Already had a post like this here, so again it might be O2 sensors or such. Get the computer scanned for codes.
in regards to the no cats, unless you have MIL's you're definately going to have problems. Get it scanned and get a tuner to get it tuned properly to fix the air/fuel ratio.