start rough won't idle on 1994 Ford F-350

Actual engine mileage unknown. Has had the coil, spark plus, wires, and ignition module replaced. distributor is ok and the timing is set correctly, but the truck starts hard, and idles like a jharley for 15-30 sends then dies. Not sure what to check next, help!

Asked by for the 1994 Ford F-350
1 answer
vacuum leaks are a possibility. there is an idle air control motor that may have failed too.