sensors

i have a 1987 f-150 xlt lariet with the 5.0 and auto trans.have a bad idleing problem cant seem to pull the codes on this truck.had smoke test done fixed a couple of vacume lines and had leak on egr valve and egr vacume selonid.replaced both and iac and tps still the same.what other sensors affect the idle?on cold start up has very high idle for mabey 20 seconds thenfalls some takes 2 minietes to idles close to normal then starts surgeing from normal to almost dyeing.does the map sensor affect idleing ?just cant figure this out on my own need help.thanks charles