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When I replaced the knock sensor & harness, I had to remove the intake manifold which means the fuel injectors had to be removed. Went online and considered sending my injectors to one of the shops that test & clean, I found some videos on how to test them yourself using hypodermic syringes, carb cleaner & a 9v battery. I did that and the injectors appeared to work fine. One of The pic shows part of my test rig. the small line has a smaller syringe that fits over the input end of the injector (the end of it is barely insight). You fill the large syringe with carb cleaner and use the plunger to create pressure, then touch the connectors for the 9v battery to test. There are some youtube videos showing people doing the procedure. Will try to get a better pic later, While investigating sending my injectors off, I also looked at what "new" (rebuilt) injectors would cost. I found several folks selling injectors that have 4 injection holes- supposed to make much more atomization of the fuel and get more power. Has anyone tried these? I gather our ECU's are supposed to be able to trim the fuel so they work with no mods. Here is an ad that has a video embedded for the 4 holers. http://www.ebay.com/itm/Toyota-4Runner-Pickup-89-95-3VZE-3-0L-V6-4-hole-upgrade-fuel-injectors-w-video-/261228448791 The injThe injc The injector pics are of the stock injectors