Engine Miss Fire,when Put Footdown It Stops ,it Is Getting A Pain Now

[fish 10]

please help,just bought car has only 78000 on clock,changed oil and filter today,cars still same ,idles perfect,accelarates perfect,cant keep it at one speed .ie try holding it at 70 miss fires put foot down car goes great,slow down car miss fires again,had engine diagnosis today no problem codes what so ever,the guy said nothing wrong with it,well it feels like a petrol car running on 3 cylinders,had full service 9mths ago at fords got records and reciets to prove it,full service history,it is cracking me up,water level havent dropped in expansion tank,one very confused new owner

[Stoney871]

Hi, it could be a faulty cam position sensor or a throttle position sensor.

[fish 10]

thanks for the advice,