my throttle linkage on my d.d. is like sticking or somthing. it doesn't return all the way. i can move it back like a 1/16. so when im at a stop it sounds like it idles really high but, when i move the linkage back it sounds fine. when i give it gas i have to feather foot it or back fires out carb and somtimes pipes and if i stay on it, it will die.then when i shut if off it wants to keep runnin like the timing is too advanced. so retarded it so it wouldnt do it but it barely moves and misses like no other. i can move the linkage back but it wont stay and its very hard to move.it didnt start doin this until i pulled the 4 bolts that hold the carb to the intake just to break in my other truck and when i put them back in my d.d. it started doin this. any ideas. im goin to rebuild the carb... again and see if that will help.