HELP - 1991 Jeep Cherokee Laredo 4 X 4 Engine won't start

OK, here's the situation...

1991 Jeep, 4.0 Liter /6 engine. Been working OK till yesterday.

The Jeep won't start. Cranks all day long, engine won't fire.

It is NOT the computer. Swapped it with another from a running, same year Jeep, and it was OK.

If I remove the Air Filter into the throttle body and pour a bit of Gasoline, the engine starts and STAYS running...but the momentr I turn it off, If I leave it OFF for more than a minute, the Engine will not start.

It's almost as if I gotta prime the throttle body with fuel to get it going.

My question:

Ist this time to replace the entire Throttle Body or

Is it something like the Throttle Positioning Sensor..?

Or, is it something else..?


Thanx..




This Picture below is what the throttle body on my Jeep looks like -

When I pour the fuel directly into the butterfly valve, after I crank the valve open a bit by hand...If I then crank it, it starts and stays running.

The Throttle positioning sensor is the plastic Doo-Hickey on the Right. I don't know what the Doo-hickey on the top could be..