4000Q Stalls when I let off the gas

[Eric S]

Sounds like a vacuum leak to me.  The amount of fuel delivered is
decided based on how much fuel goes through the fuel distributor
housing.  If you are pulling air from elsewhere it will run lean since
the ECU does not realize you are getting so much air.  If you keep the
RPM up it is fine like you are describing.

Look at all the hoses carefully and I think you will find a leak.

Good luck


--  

Eric Sanborn
http://sofadog.net/4ktq/