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have a scary flat spot at 3500rpm to 5000rpm?

in any gear i have a bad flat spot at about 3500rpm to 5000rpm haven't replaced anything but have checked usual sensors for failure or dirt but nothing although removing the airflow temp has caused problems in low revs. short of plugging it into diog im clueless any ideas??
quini, February 2011
turned out it was the cat. it caught fire,thanks for the help tho

quini, February 2011
had it plugged in and came up with nothing checked pipes for leaks and reset ecu still got the drop at 400rpm is there anything else i could try

quini, February 2011
you can spend loads of cash just guessing if you want so would get it onto a code reader

cdc, February 2011
btw its a fiesta mk4 1.25 zetec

quini, February 2011