Splutering When At Engine Temp

[cossiboo]

hi all wondering if any one can help,when i got the subaru out it runs fine for about 5 mins then i have a loss of power and it sounds as if its spluttering i gave it a full oil change and plugs and it still happens ,it seems to be whan it gets up to engine temp ,weird thing is i still got it up to 80 mph today with it spluttering its alot harder to work on than an old ford all you need for the cossi is a claw hammer a 13mm spanner and a couple of layers of skin, please can anyone help cheers tam

[StrikE]

hi all wondering if any one can help,when i got the subaru out it runs fine for about 5 mins then i have a loss of power and it sounds as if its spluttering i gave it a full oil change and plugs and it still happens ,it seems to be whan it gets up to engine temp ,weird thing is i still got it up to 80 mph today with it spluttering its alot harder to work on than an old ford all you need for the cossi is a claw hammer a 13mm spanner and a couple of layers of skin, please can anyone help cheers tam

Try the ht leads and make sure they are pushed on right m8, sounds something simple as a ignition misfire