2007 Chevrolet Silverado 4.8l V-8, Low Speed/Idle Issues

drewbearddrewbeard Member Posts: 2
edited November 2017 in Chevrolet
I have a 07 Silverado, 4.8 liter, V-8, It will start and idle perfectly. Problem is, within 1/4 mile from house:
RPMS start fluctuating (400-1200 rpms); and it will die, starts up/idle perfect, I have to rev it up to 1500 rpm, ride the brake, to take off or it will keep dying. Once it warms up, it isn't as bad; but it is happening more and more often.

I have checked the codes (and replaced): Throttle Position Sensor, Vacuum Purge Solenoid Valve, and Fuel Cap; Cleaned the throttle body/plate, and Reset the ECM.

I think it is a vacuum issue, the way it acts. It seems to run better if I pump the brakes, before leaving the house?

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