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I have a lot of these but this loose wire is black, heavy gauge, with a small eye end. In a small bundle from behind engine to passenger side. See photo. Any idea what it goes to?

Ordered the AC ignition module and coil from the Rock. Wish me luck and thanks for all the advice.

That's what I'm thinking, replace them both. The question is with what. Assuming the AC Delco unit is the best for stock replacement, are the AC units on Rock Auto and Highway Stars both true AC as advertised? Assuming they are, which coil - stock AC, Borg Warner, or the hipo unit from Full...

I cleaned and tightened everything when I swapped injectors and replaced the injector harness a few weeks ago and the mount is not powder coated. The heat sink grease sounds like a good idea regardless. The one thing I haven't replaced in years is the coil pack. Is the coil just as likely as the...

I'll check them out.

I've had one in the past that looked like that. Turned to goo. Current ones look fine. I have a spare and they both have the same issue, assuming they are the problem.

It's that time of year in Texas. My 87 GN does not overheat in traffic, less than 190*, but without the normal air flow the Underwood temps seem to cause the ignition module to act up. It starts misfiring and throws a code 42. Let it cool off of start driving at normal speeds and it's fine again...