You can turn off the check engine light by disconnecting the negative battery terminal for a couple of minutes.
Check you connections make sure there on the correct way.
check clutch fan
Sounds like the engine is missing, check the plugs, wires, timing
i just changed my batterys out on my truck now my check engine light is on?
check your dip stick to see if your engine oil is too low. also check oil sending unit
Then you may want to have a mechanic check it out.
engine needs 2 b running at the right hand side of the truck at back pull out dipstick read it
Did you reset the light? I don't know what gasket you changed, but undoubtedly that was not the problem. The check engine light comes on when there is a problem with the emissions system.
not sure exactly what it took to do this but you might check it out http://www.youtube.com/watch?v=DTaQY7RSagE
I wold check your automatic choke first.
check your thermostat
changed battery engine light stays on