86 burb problems

hello i have a 1986 Gmc K2500 Starcraft "ducks unlimited" suburban and i am having a few issues. 1. a good 80% of the time i turn the truck off it diesel's and the shoot all the fuel out of the fuel bowls. i have replaced the carb removed the egr system done a tune up plugs wires rotor cap vacume lines and it still does it. now in the haynes manual i have it says to check the map sensor but i can't find it. it also says a differential sensor which looks just like the Map senors should be there but i can not find eather one of them. any thoughts would be help full. 2. the tranny shift to soon around 1500 for every gear. now if i "gun it" then the engine will get to about 2100 then shift any ideas?

Welcome to AF, what engine here ? Does it have an anti diesel solenoid on the carb? Trans has tv cable adjustment?, sounds like you could use some local pro to help you with this.

well it has the elec choke and thats about it. im sure i need to take the tranny into a shop but i hate doing that. i would rather fix it myself.
oh and it has the 350 small block

Dieseling is caused by advanced timing, engine running to hot and/or high idle, the trans shift points can be adjusted from the tv cable on the carb linkage.