Misfire under load
 

Hi , my 2002 v70 station waggon has developed a misfire whenever the engine is put under load its a 2.4 petrol with 180,000 miles , can anybody advise

have you got some new spark plugs ?

Be more descriptive in posts.
How long have you owned it? Do you know its repair and maintenance history?
Is it turbocharged or not?
Do you have a CEL?

Can you check for codes?
There are many inexpensive code readers available.
You should get one.

If your plugs are old + neglected, replacement is a good option.
However, inspection of coils is involved without knowledge. A misfire on one particular cylinder is helpful and likely recorded by the ECU with a code.

Reading a code is way smarter a first step than buying parts without intel.
P0300 is that of a random misfire. P0301 to P0305 specifies the cylinder.