I drive an '84 Jimmy, I am having problems with really high RPM's. I am not a mechanic, so i need some help. Almost everytime i fire it up, the RPM's jump up to 2000 or above, and stay there until i kick the gas and then it goes down. But as soon as I start driving again, they are right back up where they were before. I drive a manual, so it is not like the truck runs away from me, but it always wants to be at about 2000 RPM's, when i am driving, or put the clutch in, or sitting in nuetral it is all the same. Is this a problem with my electric choke, or carb, or just a throttle cable, or something completely different? With gas prices where as high as they are, this is getting expensive. thanks for any help.