I need Help, anybody.just changed the spark plugs on my 318i and it won't start.

i checked the gap. all of the plug and coil have to click when you reattach it right?. and i thought if i put the old ones back in, it would respond but nothing happened. it still cranks for a few seconds and starts for one or two seconds then turns off.

Make sure your Mass airflow meter is plugged in.