Trouble with new headers

maybe it's messing with your computer cause of the O2 sensors, unplug your battery for about 20min and then see what happens

85 Mustang GT's don't have a computer or O2 sensors

Harry
Check your plug wires and see if maybe while in the process of installing the new headers you didn't knock one loose.

If the car ran fine before the header install,it's something that happened while you installed the new headers.

Post back & let us know what you find.

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Paxton Blown 87GT
ICQ#112698436