Hello, I recently been having trouble with my 91 camaro rs 305 tbi vin e. It seems that the injectors are spraying at different rates and overspraying. When the car starts to act up,the check engine light comes on and i have to hold gas pedal to the floor to keep it running. After it cleans up the light goes off and it will do same thing again and again.I have already tryed to change map sensor and ecm. still have the same problem.what else could it be?