89 CHEVY TBI 5.7 TRUCK NO IDLE AFTER 20 SECONDS GIVE OR TAKE?

  • Thread starter Thread starter luke r
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luke r

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I REPLACED ALL SENSORS TPS, IAC, MAP, SCM, AND TWO OTHERS ON INTAKE. I CLEANED THROTTLE BODY AND REPLACED BASE GASKET. NEW PCV VALVE. NEW O2 SENSOR, CODE 12 (NORMAL???) WHEN JUMPING AB WITH WIRE. TIMING ADVANCED SLIGHTLY 3 DEGREES AND NOT AT ALL SAME RESULT. QUIET STEADY BACKFIRE THROUGH EXHAUST WHEN IDLING. POWER IS NORMAL UNDER DRIVING CONDITIONS BUT STALLS WHEN PUT IN GEAR UNLESS YOU THROTTLE UP.ANY SUGGESTIONS WELCOME.
 
Fuel pump may not be putting out enough fuel pressure.Could be a plugged fuel filter next to the frame.
 
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