I've got a 1999 Ford Focus 1.6 Zetec with 103,000 miles of the clock that has recently developed an intermittent misfiring problem.
The misfire usually occurs during acceleration in 4th or 5th gear or when accelerating hard in lower gears. Most of the time the engine idles fine however on two occasions the misfiring has been pretty severe and the engine has stalled whilst idling. So far, I've changed the plugs, leads, coil and fuel filter with no luck. I've also had my local garage run it through diagnostics that didn't find any fault either (although it apparently was idling fine throughout - typical!).
The car has been serviced regularly and the 103,000 miles are almost all easy motorway miles so I was expecting a fair bit more life out of it.
I've read other posts in various forums that describe misfiring problems but either the symptoms are different or I have already tried the suggested cures.
Has anyone got any more ideas as I'm running out fast!
Cheers,
Andrew