yo 86, WELCOME!
As Seabronco advised; in your profile, include your year, engine, trans, Xfer case & locking hub type (auto or manual) and any major mods such as body or suspension lift, etc. or in any question post. You'll get more accurate replies
Left Click your name in upper right corner; in pop-up left Click on My Profile
Below an Ad, in right side. Left Click Edit my Profile
In Left Side, Left Click Change Signature
Also is the Check Engine Light on while driving?
and it should light up when first starting the Bronco
the Self-Test
To check for codes without buying a code reader is simple. If your EEC is wired correctly, the engine light works, and there are not any electrical faults in the vehicle you can get the codes out of your EEC.
http://oldfuelinjection.com/?p=13 by by Ryan M (Fireguy50)
http://oldfuelinjection.com/?p=13
post any codes found here.
Self Test - & Connector Location Video in an 86; "...My Test Connectors and Battery are on the "right side" (passenger) behind a black EGR Vacuum Reservoir..."
Source: by JKossarides ("The Bronco", Jean) at
http://www.supermotors.net/registry/media/783663