Engine runs rough?

Has the check engine light come on? Have you checked for vacuum leaks? Finally we should look at this guide it can help us fix it

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

and

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please run down this guide and report back.

I wonder if the temp sensor is the problem. If it sends a bad signal to the computer, the air / fuel mixture may be wrong at start up.

I don't think you need a cam. One code is for a #8 cylender misfire. Have you checked the compression in that cylender? I realize you have already tuned it up.

As far as the other code, remove the EGR and make sure there is vacuum to it. Clean all carbon from it, and make sure the valve is seating properly.

Let me know what you find.
Joe

Have you checked fuel pump pressure? Also, I want you to check behind the throttle body. There is a large (aprox 3/8") vacuum hose with a 90 degree bend in it. Check to make sure it isn't broken or dry rotted. Also, I need to know if there are any other codes.

Let me know.

JOe

Sounds like fuel pressure or injector probblem also have you changed the fuel filter also check the idle air control valve

Hi:
Even though you checked for vacuum leaks, I think that is the problem causing the lean mixture. I want you to check behind the throttle body (passanger side). There is a vacuum hose that has a 90 degree bend in it from the TB. They are known to dry rot and leak. If it was a misfire caused by a coil / ignition component, it would cause more of a rich mixture.

Let me know what you find. Also, if you have no luck with that, remove the coils that are recognized on the OBD. Check the boots that go on the plugs to make sure none of them are arcing through the sides onto the valve cover. That is another common problem.

Joe

It would be great if we could get a video of the problem so I can see whats up. For now I would say lets check the fuel pressure to make sure we are okay that.

Here is a guide to help you:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Please let us know what you find.

Cheers, Ken

Have the truck scanned for codes, Autozone does it free, you can also try the wiggle test, open the hood and with the engine running, wiggles the connectors on the sensors, if it runs rough at some point, turn off the engine and seperate the connection, use contact cleaner, then die electric grease and put it back together. If any codes are stored, post here, see if you can also get any "freeze frame" Data.

Remove the Coil On Plug (COP). Remove the screw and the coil for each plug.

PO307 is cylinder misfire #7. This could be generated by the other fault
PO401 is EGR flow insufficient
P1151 is Lack of HO2S-21 Switch, Sensor Indicates Lean
check for vacuum leaks. Check/clean MAF sensor. Check items listed below

70) DTC P0401

This DTC indicates self-test has detected insufficient EGR flow. Possible causes are:
EGR valve stuck closed.
EGR valve diaphragm leak.
EGR flow plugged or restricted.
Faulty EGR hose.
EVR VPWR circuit open.
EVR VPWR circuit to PCM open or shorted to PWR.
DPFEGR sensor VPWR circuit open.
Faulty DPFEGR sensor hoses.
Faulty DPFEGR sensor.
Faulty EGR VR solenoid.
Faulty PCM.
40) DTC P1130, P1150, P1131, P1151, P1132 Or P1152: HO2S Not Switching

DTCs P1131 and P1151 indicate air/fuel ratio is correcting rich for an overly lean condition. DTCs P1132 and P1152 indicate air/fuel ratio is correcting lean for an overly rich condition. DTCs P1130 and P1150 indicate fuel system has reached maximum compensation and HO2S is not switching at the adaptive limits. Possible causes are:
Fuel system malfunction.
EGR system malfunction.
Air intake or vacuum system leak.
Engine oil level too high.
Incorrect cam timing.
Restricted air cleaner.
Faulty PCV system.