ranger, thank you for your advice. I've never tinkered with an EGR system before, but that thought of it malfunctioning has been in the back of my head. However last night, I might of got some good news (finally).
The truck wouldn't even start last night and when i turned the key to run I couldn't even hear the fuel pump going for 2 seconds. I took a screwdriver and let the pressure out of the schrader valve, but only a pathetic little amount came out of the valve (looked like 2 psi to me lol).
I noticed the check engine light was flashing and so I got the code from it just by running the KOEO (it also showed up in the CM), the code was: 542 - Fuel pump circuit open...Now i know this could also mean the fuel pump is just straight up dead, but having some background in low voltage, this is something I don't mind troubleshooting. I also noticed on the inertia switch that the wiring harness that plugs into the switch appears to be plugged in, but the top clamp that securely connects it is broken off...Do you guys think this is cause for alarm?
I have a few questions on how exactly to test...
1. How do i test continuity for the inertia switch? Just backprobing the electrical connector?
2. With the connector right before the fuel tank, is red and black the only wires i need to test and look for 12v?
Thanks as always guys, everyone's been a huge help on here