whats going on every one?

heres what going on? i just put a new head gasket on my car about 4 days ago the car was running grate. now the car will not get out of its oun way and the engine light will come on but gos right off and at the same time the rpms gos up slower and not as fast like it did. at the same to it wants to bogs down when you take off. i do not know if it is a vac line, sensor, or even the injectors. it's also gettting spark and the fuel is getting to the enjectors.

it dos have a new fuel filter, plugs, wires...

thanks for your guys help