Co.45

I just recently bought a truck from a friendfor 500 has 113k on it and isnt rusted up bad. When i bought it he told me about the rear window acting up and that it stalls. I finally got driving in it and it basically stalled at red lights randomly so i got on here found info about cpi and egr so i decided to order the tomco clean screen figuring eventually it will need it if it isnt the problem now. i have an electric egr and i pulled it out and cleaned the plate that connects to the engine covering the port spraying it at an agle. got it cleaned and back in with the tomco. there was no difference
so i checked for vacum leaks and found a couple. fixed them and now its running worse? it would idle terrible before and stall while in gear but now in park it lops reving up and down for a four to five mins then stalls?

i also checked all the vac hoses i could see in the engine compartment and i did find three that go straight back and above the tranny. so i didnt get the other end of those to check for vacume but the ones in the comapartment are all working. the previous owner also said the problems occured 6 months ago during a distributor cap change (right beside the broken hose) and he was running it like this for a while. and the main hose that was all but split in half was coming form the engine to left of the cap.

im not sure what it could be, would this problem be casued by the cpi?

and i while its runing it almost seems to run a little better if i unplug one of the vacum hoses on the backside of the engine. when you pull it, it whistles then it slows down and the engine sorta smoothes out and randomy revs up in down instead of a constant low and high idle then stall.

it is still drivable and jumps around a little bit during driving.

any help would be great