2002 st170 stuttering under acceleration

[tattymarbots]

as above

2002 107k miles st170, just had service and new cambelt before i bought it 3 weeks ago

it is suffering from quite pronounced stuttering under acceleration particularly 2nd and 3rd

once into 6th it goes really well, averaging pretty much 37-38mpg

sometimes it accelerates without stuttering so a bit stumped, thinking now its electrics rather than mechanical

took it for a quick blast last nighy and in fourth it really struggled to rev past 4.5k

any ideas what it could be

cheers
steve

[JackP1]

Is it almost like the revs are dropping or hesitating whilst accelerating?

I had this on my fiesta st, ended up having a new coil pack. Just a suggestion,

[hodgo]

Same here for coil pack, replaced on sportka. Only happened under heavyload around 1-2k revs, showing signs of it again now

[Angry Sheep]

Yup, had this on my 2003 Focus and it was the coil pack. Start there, they're cheap and easy to replace.

[igiveup]

Had the same on my 1.8 Zetec Focus, Coil Pack (and HT Leads for good measure) replaced cured in.

[bellropesbrown]

Have you checked and cleaned the crank sensor and or reset the rev limiter?

[AndyT77]

Well there is definitely something wrong with it, i struggle to get 28mpg out of my 1.8 Focus, let alone 38mpg from an ST170!