Nissan Repair: Need a diagonosis, coolant temperature sensor, intake airflow

Question
A month ago the check engin light came on. I ignored it. Two
weeks ago these symptoms manifested: Car starts and will idle but
stalls and nearly dies when gas is applied. This condition persists
until 5 or 6 minutes has gone by. Then the truck (Nissan Frontier
xe 4X2) runs fine for the rest of the day. I changed the fuel filter
and the engine coolant temperature sensor (ect) but the problem
remains. Yesterday  I had it hook up  to a computer at my
mchanic's and it came up with  a PO400 (EGR Flow Malfunction) and
a PO1336 (unknown trouble code) I am wondering what do I do
next?

Answer
Lacy,

The EGR valve needs to be replaced and then reset the code and it should run fine.  The other code is associated with the P01136 is the Intake Valve Timing Control Solenoid Valve.  This is the big vacuum valve that controls intake airflow and it should be checked and if defective replaced.