Possible Causes

Intermittent Condition
Vacuum Leak
High Resistance In MAP Sensor 5-Volt Supply Circuit
Resistance To Ground In MAP Sensor 5-Volt Supply Circuit
MAP Sensor
High Resistance In MAP Sensor Signal Circuit
Resistance To Ground In MAP Sensor Signal Circuit
High Resistance In MAP Sensor Ground Circuit
High Resistance In TP Sensor 5-Volt Supply Circuit
Resistance To Ground In TP Sensor 5-Volt Supply Circuit
TP Sensor
High Resistance In TP Sensor Signal Circuit
Resistance To Ground In TP Sensor Signal Circuit
High Resistance In TP Sensor Ground Circuit
PCM