i got a stock b16. it was running fine til yesterday. i recently did a full tune up & oil change about 3 weeks ago. now the problems is that the engine sounds like its choking up and at 3500 rpm it loses power and wants to die out. i pulled the spark plugs out and seen that they are black. what could this be? need you guys help. thanks

 

black plugs already?super rich..do u have an aftermarket fuel pressure regulator?switch to oem see what happens..

 

found da problem. the map sensor came unplug