When the truck sits for a few days it is hard to start and idles rough. Also hesitates when hitting the throttle. Once it runs for a minute it goes away, but sometimes hesitates when taking off from a stop. This goes away after it warms up and for the rest of that day. The more days it sits the worse it gets. Has only 60,000 miles. At first I thought it was the battery because at first it was hard to turn over and would start right up. Now its almost like the timing is off and getting worse, but after running a minute it gets better.
SOURCE: Hesitates like it want to flood when starting, Getting worse
Is it misfiring?? like not running on a cylinder?? If so than you need a new head gasket. Coolant is getting into the cylinder, killing the spark on a cylinder for a while until the coolant burnes off resulting in better running conditon, when warm. Your had gasket is no good. Have done many head gaskets for the exact same symptom on a Nissan Sentra.
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I think your right about the tune up. Searched the net and found that others had the same problem with the 2000 4.3L V6. It was the distributor cap. It's hard to know what can be the problem with these vehicles with electronics and computers. Dealers now have us by the balls. Thanks
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