hi
i need some help i have a 2000 4runner i love it , but when i pull my boat (1800) out of od i get the engine check light flash for a while then stay on i pulled the codes 300 303 306 random misfire #3 #6 i changed the plugs swaped the coils round to see if the misfire moved no . changed the o2 upstream sencor checked for vacum leaks , one thing i now is on the highway flat if i put it in od i do not get the light when towing , also i do not get the light when i am driving with only me in the truck or if i have 5 in the truck ,
could it be bad injectors #3 #6
can any one help please
thanks

 

Run a can of BG44K through the tank and see if it makes any difference at all.

Also, ohm the wires and see if one is out of whack or not.

Gadget