88 Ranger 2.3L EFI runs very rich

[h2ok9]

88 Ranger 2.3L eng. EFI 2wd 5spd. Installed remanufactured engine 10,000 miles ago. Runs rich all the time now. Doesn't high idle when cold. Got code for MAP sensor and replaced it. Ran normal intermittently then had trouble starting when cold. Would run rich til warmed up. Now runs very rich all the time. New plugs, rotor, distributor cap, ignition wires, ignition module, MAP sensor. Good fuel pressure on the rail 40 psi. Also got code for throttle position sensor. Replaced it and set it within voltage range limits. No help!! This is driving me nuts!! I'm about to replace the MAP sensor again as it's the main fuel air mixture sensor but they are expensive and I'm not getting a code for it. Can't find any vacuum leaks or intake leaks. Any suggestions would be appreciated. O2 sensor?? Not getting a code for it.