Fuel injectors can short-circuit on Pontiac Grand Prix

Problem Description and Possible Solution

Fuel injectors can short-circuit electrically causing a rougher than normal idle and reduced performance.

Problem Data
RepairPal Verified
Average mileage: 125,000 (125,000–125,000)
Engine affected: 3.1L V6
4 model years affected: 1990, 1991, 1992, 1993
5 people reported this problem
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Out of the blue while driving at 70Mph 2 injectors became "shorted" per the mechanic's diagnosis.