the check engine light did come back on....so i replaced all of the 02 sensor this time and reset the computer....the check engine light has stayed off but the engine is still running rough i am going to pull that same spark plug today to see if it is still messing up....i still have no placed the egr valvue auto zone said they make one for my truck but we could not find it in the engine compartment? i have a haynes manual that says where it is suppose to be located but i still cant find it

thanks for all your help guys i just hope i can get this thing fixed....if its the head gasket i have replaced one of those myself on an old chevy it was to bad to do

 

pulled the spark plug it looked OK...but truck is still running rough drove downtown today and the check engine light came back on again...all o2 sensors now im out of ideas besides the egr vavle??

 

if you have done the tune and replaced all 3 sensors, and the EGR valve and the EGR selenoid switch, and replaced the injectors ( it wouldn't hurt to return the injector for that cylinder and get a new one, often they come clogged from factory) also has the coil pack been cheked (where the plug wires hook up on top of engine) could it be firing more towars bank 2 than one

 

sounds like a faulty injector, the cylinder is running way too lean, i say replace the injector or maybe try some injector cleaner before hand just incase, so if it is just a dirty injector you don't have to spend that much money

 

my truck did the smae thing about 2 years ago and it was the timing