Hi I've been working on my 88 5.0 Mustang for about 6 months and cant seem to figure out what's wrong. I pulled the engine to replace the head gasket and to do a general overhaul. Everything went well and it fired right up after getting the timing set. It runs great at start and once reaching operating temp the idle starts to surge and gets worse until it eventually stalls. Codes call out O2 sensors but on both sides. Any help is apricated! Most of the new parts are listed below.
Head Gasket
Valve Cover Gaskets
Water Pump
Rear Main Seal
Oil Pump
Oil Pan & Gasket
EGR Valve
Fuel Pump
Fuel Filter
Spark Plugs & Wires
130amp Alternator
BBK Exhaust Headers
Coolant Temp Sensor
Intake Air Temp Sensor
T5 Fluid
Clutch and Pressure Plate
Resurfaced Flywheel
R134a Conversation
A/C Clutch Cycling Switch
A/C Condenser
Evaporator to Condenser Line
Accumulator
Compressor Discharge Line
A/C Service Attachments
High Side Adapter
Lager Battery
Head Gasket
Valve Cover Gaskets
Water Pump
Rear Main Seal
Oil Pump
Oil Pan & Gasket
EGR Valve
Fuel Pump
Fuel Filter
Spark Plugs & Wires
130amp Alternator
BBK Exhaust Headers
Coolant Temp Sensor
Intake Air Temp Sensor
T5 Fluid
Clutch and Pressure Plate
Resurfaced Flywheel
R134a Conversation
A/C Clutch Cycling Switch
A/C Condenser
Evaporator to Condenser Line
Accumulator
Compressor Discharge Line
A/C Service Attachments
High Side Adapter
Lager Battery
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