I have a 1992 F-150 with a 5.0 that I recently got from my grandpa after it had been sitting in the garage for about 4 years. As soon as I got it, I changed the oil, checked all the lines and hoses, cleaned the filters and it was running like a champ. Now, after putting about a thousand miles on it, I'm having some issues. When I went to crank it the other day, the truck would turn over and fire for about 2 seconds then shut off. I did this several times then I finally got it to stay running, but just barely. I limped the truck home and now whenever i go to crank it after it's been sitting more then a few hours, I have the same issue. I can get it to crank by putting a lil gas in the intake, but after it cranks, it idles really rough, and smokes black like it's running rich. But after I get it cranked the first time, I can shut it off then fire it right back up. (still with the same idle issues though.) I a code test run on it and got codes 172, 173, 327 or 328 and 628. I recently put in a new fuel filter, new cap and rotor, cleaned the air intake and cleaned the injectors with no avail. I also noticed that the EGR valve isn't moving. I checked, and there is a slight vacuum at the valve itself and a really strong vacuum before the EVR, so I'm not really sure what the issue is there. I'm running low on ideas and patience so your help would be highly appreciated.