hi everybody,can someone please shed some light on my big problem.i recently bought a mondeo 2.0 auto 1999 on a x plate,the problem is my rev counter is very erratic and when it gets to 4000 revs it wont go no further and the engine starts jumping around,then i lose power.i have overdrive and sport mode i try both of them with no luck.then when the engine gets warm it seems to sort it self out for a while then it comes back again.i have just had a new coil pack,ht leads,new spark plugs,and a new temp sensor put on and it dosent seem to have cured it .im at a complete loss now so i hope someone out there can help a desperate man ,ty look forward to some advice

you could try cleaning the maf sensor with carb cleaner being carefull not to damage the wire (just spray nothing else), also had this on a car once and it turned out to be tne exhaust which had collapsed in one of the boxes causing a slight blockage