Had my truck for 3 years and its always done this, now that i got some money saved up want to fix it. Whenever i first start my truck up after 4-5 hours or a day, it either starts but rmps drop and it dies after bout 5 secs, or itll stay started but be at about 1300 rpms for a minute or so. Itll always crank right back up and i know alot of old trucks do it, just wondering what exactly causes it

 

Have you pulled the idle air controll valve off and cleaned it? Have you pulled codes?

 

No haven't, so that could be a possibility? And no havent pulled codes on it

 

Yes i would clean it first. Then pull codes.