Hi,
You have a throttle cable so this is one of two things most likely. First and most likely the throttle body plate/linkage is dirty and does not fully close which means the RPM are higher then it should be. The other possible cause is the throttle cable itself is holding the throttle open just a little bit which gives the same effect of higher RPM.
I included the procedure of how to replace the throttle body. However, I don't think you need to replace it. I think you need to disassemble the intake system far enough to see the throttle plate. Once you do this, remove the throttle cable from the throttle body and make sure it is not binding. If it is, replace it. If not, clean the throttle body and then retest the vehicle.
Also, we need to check for codes. So when you are going to the parts store to get throttle body/induction cleaner, ask them to scan it for codes. Most parts stores do this for free.
Let me know the codes and what the throttle body and linkage are like then we can go from there. Thanks
Images (Click to make bigger)
Sunday, September 29th, 2019 AT 1:57 PM