I was driving my truck today and it started to run terribly rough knocked a few times, sounded like it was running on one cylinder and then shut down. IT WONT START AT ALL NOW! I was having problems with it off and on where the engine would shake like crazy for a while and then run like normal. It did this for a while and finally had it today. I dont think its the CPS because it didnt just shutoff randomly, it got worse and worse really quick and now it wont start. What is the problem?
Scan for codes, check the oil level, check the cps ( even replace it), Check the fuel supply pump, fuel filter, fill the fuel tank up. The fuel gauge may not be accurate and you may have an empty tank.
What you are describing sounds like fuel starvation. Which most likely is a fuel supply problem. Even the pick up tube in the tank could be clogged.
Have a fuel pressure test done. See how much fuel pressure you have coming out of the fuel supply pump.
If you do not know where the fuel supply pump is located. It is located on the driverside frame rail, it is almost directly underneath the driverside door on the inside of the frame rail. Check and see if you have power coming to the pump.
Another thing you can do is crawl underneath the truck. Have someone turn the key on the pump should run for 5-10 seconds to prime the system. If you do not hear the pump kick on when the key is turned on then you could have a bad pump or no power going to the pump.
If you have no power going to the pump check the fuses in the cab and under the hood. If you have no blown fuses then you need to start checking the wire going to the pump for continuity. This should tell you if the wire going to your pump is shorted out.