I'm thinking it's not the throttle or choke, but the spark plug is a high possibility, it was removed during the recent service and may not have been put back in correctly. Blown head gasket? I hope not. I'll check the spark plug tomorrow, thanks!
I'm guessing the power loss is due to the lack of compression as air escapes through the spark plug hole?
If then God so clothe the grass, wich is today in the field, and tomorrow is cast into the oven; how much more [will he clothe] you, O ye of little faith? (Luke 12:28)
For if we live, we live to the Lord, and if we die, we die to the Lord. So then, whether we live or whether we die, we are the Lord's. (Romans 14:8)