Loss of power under load

[karmann]

My G has started to not want go under load. Cruise along, fully press the gas pedal and it dosnt want to excellerate, it kinda bogs down, seems to be fine when cool but when It's upto full operating temp just dosnt want to get up and go, any ideas?

[hayesey]

Is it misfiring?

[karmann]

Seems to run fine until under load, so not sure about mis firing

[hardchargin40]

Lambda Sensor or is the boost blowing the spark out, therefore knackered coil/plugs other ignition perhaps?