My 2003 Pontiac Sunfire has been doing something weird lately. My
Sunfire has a standard transmission with 30,000 kms, and sometimes
when I stop at a red light and push in the clutch, the motor is stuck
revving at 3000 rpm. Sometimes when idleing it will fluctuate on its
own between 500 rpm to 3000 rpm. The car will also start hitching
while travelling down the highway. Usually seems to occur when the
weather is wet. GM Mechanic is stumped!