judder ? what could it be

[corsabug]

i got a 1.4 gls , xe engine . the other day i filled up at texaco carried on to work all was fine . then on the way home going through the gears not fast or hard just cruisin it's started to judder 2nd through to 4th . but once its been running for half an hour it smooths out then stops juddering all together ...

what could it be .. timing , feuling ,driveshaft ?

if its the shaft how can you check it

thanx

[corsabug]

hi again .. this aint spaming lol

my judder is even more of an issue today . feels like the engine wants to jump under the car at 50mph .... i'm thinking gearbox . i've run through a good 30 quids worth of usually decent fuel over three fill ups . an its still there . serviced it today oil , fuel filter plugs . when doing the plugs i noticed oil round the tops of all four , i think there is an inner gasket thats fryed . so having a bash at that as soon as .
could the gasket be causing the judder ?

has anyone got any ideas please . this motors done me good cost peanuts seriously !! over four years i'm impressed hehe . had two fords previously (moneypits) understatement

98k n the corsa needs abit of tlc

[corsabug]

and what sort of box is it ... i think its f15 .. is this right ?