Mossimo 500 efi utv stalls after startup loads up real bad. After it clears up it runs fine. Then kill it it might start but have to feather pedal. Fouls plug , Unhook injector, and fuel pump , replace plug, hit it with startin fluid till it starts. Plug all back in. Good for a bit. Cleaned 02 sensor, injector,map sensor, idle control valve, set valves, please tell me what I’m missing any and all help appreciated.