My Mondeo 1997 keeps 'kangarooing'?

THIS COULD BE MANY THINGS TRY THE SPARK PLUGS AND LEADS AND IF THIS IS NOT THE CASE IF A 2.0LTR 16 VALVE ZETEC OR 1.8 ZETEC THESE HAVE A COMMON FAULT THERE IS A AIRBOX ON THE LFT PASSENGER SIDE OF CAR BEHIND HEADLIGHT . THAT GOES TO INJECTION UNIT LOCATE THIS BOX LOOK ONTOP THERE IS A AIR FLOW METER A LITTLE BLACK BOX BOLTED TO TOP CHANGE THIS INSTALL NEW ONE AS THESE CAUSE MANY PROBLEMS

M FOSBERRY
February 2007