Need some help
Reply #3 –
I had a problem like that a while back, been to long to remember exactly the car was doing but I remember replacing the throttle position sensor and it's ran fine ever since.
You may try spraying a little WD40 or the likes on the sensor to see it that free's it up, if so then it needs replacin'.
Then again, I think you have a different engine configuration on an 86. I have the 85 Thunderbird with the 5.0