Dodge Repair: dodge ram pickup will not idle, dodge d150, dodge ram

Question
I have a 1985 dodge d150. has served me well since i bought it new. it has a 5.2/381, 2bbl, 2wd, at.  I dfon't use it much anymore just to haul home improvemnt/garden supplies etc. the last ime I drove it I had a problem with it starts and drives fine. but about 10 min after it warms up it stops ideling. it will run as lonng as i keep my foot on the accelerator. I though it might be the choke heater/thermostat. but now I doon't think thats it I started it today and the butter valve on the carburator seemed to be woorking fine . it was closed when i started and slowly opened as the engine warmed up. I drove it a few miles and it started exhibiting the same symptoms I described in the beginning of this message. Would you please give me an idea where to start checking?  I hope you can help me out with this problem. any thing would be appreciated
Thanks john

Answer
hello john
the gas filter should be changed and also check the gasket on the fuel pump make sure the bolts did not come louse might seem grazzy but have sean it happen and could be fuel pump the diagraim is breaking down this is a good old truck and simpile to work on if u need more help let me know pete