Trying to figure out my loping problem

[nativebroncofan]

I posted this in another thread and have had no action on it. So I'm re posting it by it's self.



The bracket that contains the map sensor also contains the EST module and another device that has a tube from the EGR and a tube from the back side of the TBI unit. It has an adjuster screw inside of an air filter. What is this part??
I think I figured this one out. Is it the EGR solenoid?
I have had a lopeing problem with this truck since I've had it. The emissions control stuff has been removed by the PO.
Replaced several different items, The IAC valve, o2 sensor, knock sensor, ESC sensor, fuel pump relay, thermostat, ignition control module, ignition coil, MAP sensor and generator, cap and rotor. The EGR valve holds vacume and it has new, correctly gapped plugs. All the vacuum/coolant hoses have been replaced in the last year.

I also replaced the one way check valve on the drivers side of the engine. Then I happened to unplug the MAP sensor and Viola, the lopeing problem vanished. With the Map sensor plugged in it barely wants run.
The ECM has always had a code 44(lean exhaust) I have been able to eliminate other codes by replacing the parts that I stated above.
Now I have a fuel pressure tester that I plan on hooking up this weekend to test out the fuel pump.
Am I doing any harm to the system, running it with out the MAP sensor plugged in? I get a strong sulfur smell as it gets driven.

I don't have any computer stuff for it, Just a paper clip and a
Haynes manual. Wish that I could afford all that technology but that will have to wait for now.

So what do you guys think
Thanks in advance,
nativebroncofan