Truck runs rough

A couple of possible problems, low compression on one or more cylinders, possibly a burned valve, possible headgasket leaks, have the compression tested and checked for a headgasket leak, both of these conditions would cause a rough idle and then seem to run normally when warmed up.

Change the fuel pump its faulty.

check the injectors and make sure there is fire on those plugs in 3 and 4

The check engine lamp will flash when the computer/emission system sees a problem that could possibly damage the catalytic converter or other components. Often the cause is a cylinder or cylinders that are misfiring which will make the engine run rough. Because the light has been flashing you should have the problem checked out and repaired to avoid any possible damage. Good luck, hope this helps!

YEP DIRTY CLOGGED STOPPED UP FUEL INJECTORS OR FUEL FILTER WILL CAUSE MISFIRE ROUGH IDLING ENGINE.HESITATION ON ACCELERATION.YOU WILL GET THE SAME PROBLEMS WITH CLOGGED INJECTORS LIKE TIMING PROBLEMS.

it could be a cracked ht lead check for any shorting in the dark you may need to replace the ht leads dampness or condensation can cause this

check your egr system this could possibly be your problem. if the valve sticks it will make it run rough and put the check engine light on.

coil packs or leads probably, does it get worse is you put your foot down?

Hi check all the fuse. fi the fuse are ok . remove the coil pack and reverce if the cly missifire change replace the coil if not chage replace the electronic comtrol module ok.

make sure you have the plugs gapped properly this can also cause this problem