car floods cylinders with gas

What is your question?

ok. so my sentra has recently been running of 3 cylinders.. so i went out and put a full tune up on it.. didnt change anything.. i then replaced the injector on the # 3 cylinder and it didnt fix the miss fire. so next i replaced the fuel pressure regulator and clecked all over for vaccume leaks.. could not find any.. the check engine light does not come on either. could this possibly be a bad ground on the ECM or a faulty ECM? the car will flood with so much fuel on top the pistons (mostly the 3rd) that if i turn the engine over with no plugs in it it shoots gass out of the cylinders like a fountain.. what would cause the cylinders to fill up with so much fuel even while the car is shut off?