High Idle on Toyota truck!!?

Ok, my 1989 toyota pick up 4x4 has a high idle, what could this mean and what can i do without taking it to the shop, i don't have the time to time to take it and not the money either, all my money goes to my Baja trucks and my horses.....
Does it help if i tell you that it stick, it was in bad condition when i go it 2 years ago and i am just now starting to fix it up....
 
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