Originally Posted by Mrmerlin (Post 5372752)

Fred with your 86 the engine harness is a bit different and rather easy to disconnect the various wires.
on on an 87 and newer cars the intake manifold has a few connectors that just about require the intake to be removed to take them apart and putting them back on is another hassle so its much easier to do this with the engine removed for 87 and newer reference the throttle position sensor and the ISV