The vat sydtem will let a truck start for about 3 seconds before cutting spark. Seriously doubt its vats

 

Replace both your crank and cam sensor. Im confident it will fix your issue, and if it doesnt, they are both great maintenance items at 285,000. Theyre due for a failure soon if they arent causing your current issues.

I wouldnt expect a fuse since it started as an intermittent issue.

 

Yes I checked the fuses under the dash as well. And when I turn the key on it alternates every 5 seconds between the red battery and low fuel. The security light flashes when the door is open but it's always does that.

 

I'm starting to lean more towards the crank sensor. Especially after going through the scanner and finding this on the security data

 

Wouldnt be first time a bad crank sensor has caused an issue!!

 

So I changed the cam position sensor and it's the same

 

*crank position sensor my bad

 

you mentioned there was a voltage drop at key-on. how bad is it?

 

3-4 volts if I remember right.

Here's another theory and I'm gonna get **** for this but currently i just got it started and running and everything seemed fine and I got home turned it off and same problem and I checked the ignition and fuel pump relays and they were hot so I took them out and put an ice pack on them for a few mins and it started right up......I have a walbro 450 in the tank and running it through the stock harness cause my Hotwire kit I had on it burned a pin up from a bad ground issue. Think it could be causing the relays to get too hot and not work right? Cause they were hot enough to burn your finger

 

I think you need to check the wiring if relays are getting hot something is shorted, surprised you arent blowing fuses if relats are that hot....