1990 Ford Ranger eng. won't start

i had codes pulled 4 times inthe last year every time differant. 1 time egr,i replaced 1 time 1 side ign. mod firing intermit. 1time primery circuit to fuel pump fauty.1temp send.unit malfunction. i replaced both temp. sensers, egr valuve. both times it seemed to solve prob.at that time truck was running. ck eng. lite intermit. i would be running 65-70 mph,eng would start flooding,lose power, then pick up and run fine. every time i replaced a component i beleved problem solved,but not. iwas driving 55 truck quit as if ign. turned off will not start replaced driver side coil,fuel press. regulater and controll mod. no help while f.p.r. was off fuel in untake pulled plug on pass. side xlnt spark eng turns no start. driver side no spark