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WHEN I START IT RUNS AND IDLES FINE,AFTER A FEW MINUTES I GIVE GAS WHIT PEDAL AND SOUND LIKE ITS STARVING FOR GAS,I PRESSURE TEST GAS LINE OK
CHANGE GAS FILTER
OIL CHANGE
AND FIRE IS 100%
PLEASE COME BACK TO ME WHIT ANSWER
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I would start by checking the catalitc converter when these clogg the moter cant push out enough air for it to climb rpms but it will run fin at low rpms... Also as they heat up the metal expands closeing them off even more.
Have someone listen at the gas cap for the fuel pump humm when you first start the motor and keep listening if it stops hummimg. The piump may wok when there is low pressure in line and stop after build up of pressure.
it looks like your engine is having an over rich fuel mixture maybe, thatswhy when you press the pedal to the floor it starts becouse you allow lots of air to help clean the mixture while cranking, also you should have black smoke in the tailpipe until it cleans up and runs fine, i think youre having a leak in one our more injectors you should check them first for proper seal under pressure these is done in an injector test machine, second it may be a defective map sensor these trucks some times have a bad map and dont give a MIL (malfunction indacator lamp) and last but more rare to be is a blocked fuel pressure regulator chek fuel pressure it should be between 38 and 45 psi and it shoul hold these pressure when you turn off the engine if pressure drops fast its injector seal problems or fuel pump check
You may have a problem with the check valve in the fuel pump, if this valve is defective the gas drains back to the fuel tank and causes long crank times, you can test this by hooking up a fuel pressure guage at the fuel injector fuel supply line on the top of the engine, run the engine for a moment and quickly record the pressure when you shut down, that pressure reading should not drop more than 5 PSI overnight, if the check valve is bad the pressure will most likely start to drop right away, but do the over night test anyway. If this is the problem you will need to replace the fuel pump in the gas tank.
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