OK. Before anybody gets their feathers ruffled, the ice pick tech tip probably has it's use when you're out in the boonies and are trying to get home with only limited tools and no scanner for diagnosis. Kind of in league with WD-40 and duct tape. That said, let me share my findings before someone else spends more money on the same discovery. Knowing a fair amount about a variety of automotive and motorcycle electrical connectors, I was curious to see just what is being done to the female terminal of the injector harness connector by shoving an ice pick through it. So, rather than using my truck as a test rat, I bought four connectors from RockAuto.com. Chevy wanted $70 each, Rock Auto wanted $20 ( I never buy just one). Anyway, looking INTO the wiring harness connector, there are ports above and below the two large slots that receive the blade terminals of the injector. The small ports are to release the terminals from the plastic body of the connector. I inserted a very small pair of tweezers (hospital type) into the ports of each terminal and gently withdrew it from the connector body by pulling the wire. Voila!! The terminal has a lock tab on the top and bottom of the female terminal that "click" when inserted. So, if you jam an ice pick through the connector, as directed, you effectively mangle the female box terminal and likely could never remove it from the plastic connector body. I serviced mine with a small copper brush, CRC electrical spray and dielectric grease for the seals WITHOUT REMOVING THE FEMALE TERMINAL. A Q-Tip and some CRC worked to clean the injector cavity terminals. If you are getting injector "rattle", but do not get codes P0201 through P0208, the injectors are providing continuity and load verification to satisfy the computer. This doesn't mean they're discharging fuel properly, as was the case with my engine, and could only be pinpointed with the Tech2 scanner. If you want to see what an electrically failed injector does to engine operation, carefully disconnect #7 as it is the easiest to get to. Your engine will barely run with no power and lots of smoke if you increase throttle, because it's only running on one bank. You will get codes P0207 and P2146, which will lock in and have to be cleared. I read lots of forums looking for a simple cheap cure, but I just wasted two days. Chevy scanned it through the OBDII port for $100, found #8 cylinder missing and the fuel balance way off the mark. Replaced #8 injector and problem solved. In closing, I only posted this to save someone else a big expense and from wasting time. The axiom is, "We learn from bad experiences, other people's, if we're smart."