89 idle HELP PLEASE!!!!!!!!!!!!!

[snapon80]

my truck runs good except when i go to pull out at a stop sign or somthing from idle it drops from 1000rpms to little under 500 thats not good but i dont know what the problem could someone help please
(P.S. it jumps back up to over 1000rpms in a few seconds )
last tune up was only about 2 months ago
it has a little over 81 thousand miles on it
whats that "CEL"
and i only get about 14 mpg
and the problem is random when hot and cold sometimes it does and sometimes it doesnt
and thanks for the response pete

[Psychopete]

Originally Posted by snapon80

my truck runs good except when i go to pull out at a stop sign or somthing from idle it drops from 1000rpms to little under 500 thats not good but i dont know what the problem could someone help please
(P.S. it jumps back up to over 1000rpms in a few seconds )

Last tune up? How many miles? CEL present? Fuel mileage? Does it do this when the engine is warm, cold, or both? The problem could be a great magnitude of things, please give more details.

Pete