Pulling out of the parking lot the truck just shut down, it turns over fine but wont fire. I dont hear the fuel pump and I noticed the cooling fan comes right on when key is on. Im thinking after reading various posts it might be the IPDM but im not sure what to test. I have also had intermittent problems with the door locks having episodes of continuous locking while driving that I thought might be related to th IPDM. I tried the relay swap but didnt help.