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URQ --pop's

Andrew,My '83 URQ does the same thing and I am about to tackle the 
problem any time now.Some thoughts on the subject:

Since I am sure it is caused by an open loop lean condition it could be,
A.Cold fuel pressure incorrect (warm up regulator).
B.Idle speed to low.(reduced air flow thru the air flow sensor,plunger 
                      in the fuel distributor to low).

If you don't have a hard start problem when the engine is cold I think 
that rules out problems with the cold start injector.

Anyone else have any ideas.The car performs very well otherwise.