fiesta problem

[fairy35]

My 1.4i fiesta zetec starts up ok but when i excelerate the car starts to chug and jerk it doesnt have any life, the engine maintenance light appears

[woodchopper]

My wife's fiesta had an identical problem to yours - I traced it by process of elimination to the Coil Pack - the
" box " where the spark plug leads come from. Changed it and solved the problem.
Apparently it is a common enough problem. They cost about �60 - �70 and are easy enough to replace if you are such a way inclined - just watch if you change it you don't mix the leads up.