Hey all!! Just bought my first bronco yesterday. It's a '90 5.8 with 113k miles. Upon cold start up, the idle will alternate between fast and slower idle speeds. Any idea what I can check to fix the alternating soeeds?
I have absolutely have no idea when the last time it had a tune up. There a few things I want to do up front. Transmission service, vacuum lines, diff service, and other cheap and minor things that make a big difference. I know it has a rebuilt motor as well, but not clear as to how long ago.