The manual says it could be the Fuel Pressure Regulator (FPR) - leaking diaphram:
HC6 CHECK PRESSURE REGULATOR DIAPHRAGM
Start engine and run engine for 10 seconds.
Key off, wait 10 seconds.
Key off, remove vacuum hose from fuel pressure regulator port.
Inspect for fuel in the vacuum hose or regulator port.
Is the vacuum hose and regulator port free of fuel?
No
REPLACE fuel pressure regulator. RESTORE vehicle. RECHECK for fuel in the vacuum hose and regulator port.
Also could be a leaking injector or a bad Fuel pump.
AL
Red '98 SVT E0 3098/6535
KKM, Elizabethan EGR Plate, TH fix
OMP front brace
Hightower rear brace
DMD
B&M with reverse lockout disabled and centering spring removed
Mobil 1 oil and trans fluid
A6 Side Markers, Optima orange, Horn recontent
Painted Sail Panels
VooDoo Knob and pedals, RogerR deadpedal
Blau Houston & CD changer
Cup holders that work
Donnelly mirror
BAT Sill Plates
and a Bullitt fuel door
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