Why the engine of a 1999 4runner will not start after a soft rollover?

Same thing happened to me

if it will crank and start but not keep running check the conector to the MAS on the top of the air filter box it may have become disconnected, that's what happened when my pickup rolled, and the guys who stole it destroyed the starter trying to get it to go, also check your oil level it may have ended up in the cylinders by draining through he intake so remove the plugs which are probably fouled with oil and turn the engine over to expel the oil( if you have done this with the plugs in damage may have occured, and replace the plugs with new ones. It will smoke pretty bad for a while but should clean up.