if the shutoff solenoid reads infinity then your truck will do nothing. You said it idles then dies when you let off. The solenoid IS NOT the problem. save your money. adjust the idle. the afc / fuel plate adjustment may also have made her go south () you should be idling at 925+.- in drive with the ac on and the truck up to operating temps. Hope this helps. If you really wanna check the solenoid, turn the key to run get out and pull up on the solenoid if it goes up and stays, you are fine if it doesn't, post back