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Discussion Starter #1
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?
 

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Congratulations on your FSB. Do u know when the last time was it got a tune up? Might be as simple as that.

Air filter
O2 sensor
Spark Plugs
New wires and distributor

Also if you got those brittle hard plastic vacuum lines make sure to replace those with silicone tubing.
 

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Or you can try running a bottle or 2 or 3 of Techron Fuel System Cleaner thru your system. :toothless

 

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Discussion Starter #4
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.
 
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