Engine Spout connector (Code 18)
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Y'all know better than to let your plug wires lay around all willy nilly, those wires are pretty stout but heat and rubbing will shorten their life. Actually any wires need covering and held in place. 
The chip was from the 90s.
It came with the extension piece at the bottom of this picture to make up for the thickness of the chip (to retain the harness to the computer).
It also came with a "octane rod" (to replace the original), thats only used in fords stock distributors.
Over 2 decades ago I contacted MSD about the octane rod (they didn't know anything about it) as their replacement distributors didn't have it.
(The rod only adjusted the timing minimally by slightly rotating the internals instead of the normal method per the distributor bolt).
I have 1 of these chips (with bolt & octane rod still in the distributor) in the back of a drawer lol
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It came with the extension piece at the bottom of this picture to make up for the thickness of the chip (to retain the harness to the computer).
It also came with a "octane rod" (to replace the original), thats only used in fords stock distributors.
Over 2 decades ago I contacted MSD about the octane rod (they didn't know anything about it) as their replacement distributors didn't have it.
(The rod only adjusted the timing minimally by slightly rotating the internals instead of the normal method per the distributor bolt).
I have 1 of these chips (with bolt & octane rod still in the distributor) in the back of a drawer lol
.
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It can mess up your gas mileage, it's supposed to enhance performance/drive ability if it is a 'chip' and programmed for modifications that have been added, not knowing any more about it I would remove it.
Not having the extension piece only means that the bolt in the engine harness 60 pin connector would not retain the harness as intended by the factory which you alluded to in Post #8. Not ideal by any means but like the General stated and you have done punt it until you resolve the issue to rule it out.
In all honesty I would say it probably does little more than a good tune up and bumping the timing to 14 degrees did back in the day if the motor is stock. I am one of those guys that fully believes that the only way you get your money's worth from a tune it to put it on a dyno and tune it on a dyno. And if you are doing this you better have changed the heads, cam, intakes, injectors, cold air intake, etc otherwise tuning a basically stock EEC-IV motor won't net you the hp to make the dollars spent worth it unless you are in some type of stock class racing bracket or series.
In all honesty I would say it probably does little more than a good tune up and bumping the timing to 14 degrees did back in the day if the motor is stock. I am one of those guys that fully believes that the only way you get your money's worth from a tune it to put it on a dyno and tune it on a dyno. And if you are doing this you better have changed the heads, cam, intakes, injectors, cold air intake, etc otherwise tuning a basically stock EEC-IV motor won't net you the hp to make the dollars spent worth it unless you are in some type of stock class racing bracket or series.
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