Hi msp9745,
Thank you for your donations.
Your symptom points to a faulty speed sensor. The item is located below the thermostat housing bolted on top of the trans meter gear unit.
At times the D4 light will blink when driving and CEL shows?
Bridging the SCS connector behind the glove compartment should provide some answer to the error code.
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Thursday, July 31st, 2008 AT 7:17 PM