[Maxxedout04LLY]

While #2 and #7 are notorious, it's the same connector on all cylinders, so any of them can go bad (i.e., loosen for a bad connection). Looks like #1 for you now. I would just replace that one for now. You can replace all of them, although some are very hard to get to. Unless you have other harness issues (usually rub-throughs), I wouldn't replace it.

I used the cheap knock-offs over 4 years ago (4 for $16 back then, but I see they're now 8 for $16 but I don't if they're the same), from Amazon. I only did #2 and #7 and they're still good. My day for others may come.

Thanks for the info Jake. I had previously replaced #2 & #7, with the lower cost straight plugs. The issue with them seemed to be that there was a strain on them which eventually caused a disconnect. The replacements came with longer wires, which enabled me to give them some slack. Unfortunately now #1 is the problem and I'm guessing #8 will be next. I guess I'll replace both of them. They should have been engineered with right angle plugs, like those that come with the expensive "fix" kit for upwards of $300. GM still says that there is no recall, or service letter for this debacle, yet they sell the kit to fix it! It's all about the $$$!