I replaced the thermostat in my impala, and now
the rpms are running way too high. It's going about
50 mph and I'm barely pressing on the gas pedal.
Normally I have to press a little bit to get up to that
speed from a dead stop. Any advice or ideas?
See if a vacuum line came off or cracked and is leaking. Vacuum leaks cause high Idle.
I'll check that tomorrow. I didn't even think of that.
Just look around in the area you were working. Something may be disconnected. I agree with enginecreator on this.
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