I have a 2004 crossfire base manual and when I reach about 30 mph the rpms go up to redline while driving. The only way I can get it to go down is to shut the car off while I'm costing with the clutch in. It only does this when I reach 30 miles an hour. Any reason this might happen? I tried the throttle reset procedure a couple times but to no avail. The car sat for a couple of weeks in the winter and this problem happened after I started driving it again.

It starts after I put it in 3rd. But even when it's in gear the car is still accelerating with no input on the gas. After I press the clutch in it then goes to redline and I have to shut the car off.