93 300zx... motor bog????

[side561ways]

my friend has a 93 300zx, it starting hesatating out of no where, we changed the fuel filter, fuel pump is fine, we checked the injectors and when we unplug the second cylinder on the left bank it runs the same as if it were pluged in, so could that be the injector or the wiring harness, ECU... ect... im stumped, were stumped.. any imput would be great thanks guys.. and the problem with my s13 was the fuel pump.. thanks alot:bigthumbu:bigthumbu:bigthumbu

 

[Vas]

check wiring to the coil pack for proper power and ground, if thats OK then change the coil pack.

 

[mongooze]

Swap coil packs from a known good cylinder. OK. change spark plug. OK. check injector, get a stethoscope and put it up to the injector and listen to see if it clicks. Nothing, contact me.