corsa 1.2 merit loss of power under load?

hi guys,
i am hoping u can help my vauxhall corsa merit 1.2 has lost all power when under load out of gear it will rev but when i engage the gears it looses power i did the paper clip test it came up with code 22 which is throttle position sensor low voltage this was checked and sensor changed with no luck also checked the air flow which seems fine....at a loss now