I am getting P0302. What should i do? Where are the fuel injectors? on 2002 Chevrolet Trailblazer

I replaced all 6 spark plugs since they were the originals and I has 143K on them. The misfire came back right away. So I replaced the coil pack on cylinder #2, I cleared the code but it came back. I drive about 3000 miles a year, and I have been putting fuel system cleaner in with almost every tank. I was thinking of switching fuel injector on cylinders 2 and 3 to see if the misfire travels to 3 to isolate the fuel injector as the problem. I just dont know where the fuel injectors are. Can someone show me where they are? Is this a good idea?

by in Centereach, NY on September 04, 2012
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1 answer 2 comments
ANSWER by , September 04, 2012
Check compression and injector pulse first. Need repair man. for details. Adv. Auto good place to pick up manual. Then you will have it for other repairs.
COMMENT by , September 09, 2012
If you can get your hand in to unplug the injector wire (safely) while it's running , do that and see if you get any RPM drop when you unplug it -or- if you notice a brief jump in RPM when you plug it back in. and if you can get a test light on it check for pulse while running. ALSO , maybe befroe you go to that trouble , check the wires to it carefully for rodent sabotage.
COMMENT by , September 09, 2012
What engine 4.2? Never mind it has to be!