1986 F150 Stalling...

Hello, I have a 1986 Ford F150 that will start and idle like the day it came off of the show room floor. It has a 302 with fuel injection. But here-in lies the problem. When you drive it will sometimes stall as you come to a stop. You need to wait around 15-30 seconds..{I know because I counted, what else do you have to do while waiting?} and it will start right up like nothing happened. And will be fine if you happen to stop several times later down the road, but then will act up again just on a whim. I have replaced the distributer, ingnition module, plugs and wires. It has dual tanks so I thought maybe the fuel pump was getting bad so I switched tanks, but it did no good. So any ideas will be appreciated!!! :banghead: :banghead:

Well, thanks for all the replys....:wave:. But it was the EGR valve. Replaced it today and not a problem anymore, starts better than any Chevy ever will. :cheers: