Your evaprative emissions could be purging into the engine at that point too, giving too rich a mixture.
here's what you are referring to:
ISSUE:
A reduced power, hesitation, stalling at low vehicle speed, idling and/or a no start condition may occur on some vehicles in hot ambient temperatures and/or high altitudes. In addition, a no start may result while the engine is still hot and the vehicle has been parked for a short period. A stall may also occur when moving the vehicle from idle. This may be caused by a lack of vapor ports in the fuel pump, resulting in a vapor lock condition or internal high wear of the fuel pump components due to tank contaminants.
ACTION:
Perform normal diagnostic routines as described in the appropriate year Powertrain Control/Emissions Diagnosis Manual (PC/ED). If the condition still exists after all diagnostics are followed, replace the fuel pump with a new turbine fuel pump. Refer to the following Part Application Chart for correct part usage. Also, replace in-line fuel filter with a new filter (E7DZ-9155-A). The new turbine fuel pump will reduce the possibility of vapor lock in high ambient temperatures. Refer to the appropriate model/year Service Manual for removal and installation procedures.
PART APPLICATION CHART
Model Year
Vehicle
Application
Part Number
1986-95
Taurus/Sable
16 gal. tank - analog cluster
F4DZ-9H307-A
1986-95
Taurus/Sable
18.6 gal. tank - analog cluster
F4DZ-9H307-B
1988-94
Continental
18.6 gal. tank - electronic cluster
F4DZ-9H307-B
1986-89
Taurus/Sable
18.6 gal. tank - electronic cluster
F4DZ-9H307-A
1990-95
Taurus/Sable
18.6 gal. tank - electronic cluster
F4DZ-9H307-C
PART NUMBER
PART NAME
F4DZ-9H307-A
Fuel Pump And Sender Assembly
F4DZ-9H307-B
Fuel Pump And Sender Assembly
F4DZ-9H307-C
Fuel Pump And Sender Assembly
F4PZ-9H307-A
Fuel Pump And Sender Assembly
E7DZ-9155-A
Fuel Filter
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have not yet checked the fuel filter, but this suggestion goes along with my thinking based on what I've read about the defective fuel filters. Thank You
Once it stalls out, try to find out if you are getting fuel pressure. If it stalls out and you still have fuel pressure your probably going to have to look somewhere else like losing ignition, a defective O2 or an EGR staying wide open.
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