Fuel injectors

Ok I'll check those out too, thanks!

I have an update on the injector circuit problem, I ran a few test and I replaced the injector harness, so far nothing has changed, it accelerates a little better but for the most part it's still running rough at times and it's all pointing to the injector itself. I wasn't able to check for air leaks yet, I'm still trying to find a cheap and effective way, I was thinking of running smoke through the brake booster air line to check that, I also pulled the codes again and this is what came up:
P0301 cylinder 1 misfire
P0171 fuel system too lean (cylinder 1)
P0201 cylinder 1 injector curcuit malfunction
P1131 lack of HO2S-11 switching
That's all I have for now, I'm going to test the compression in cylinder 1 tomorrow to make sure that's ok, let me know what you guys think, thank you!

I ran some test on the injector today (what I could), the first test was with a long screw driver and I did hear the clicking noise plain as day, I did the same with a different injector and I noticed a different sound of clicking, I didn't know if that mattered or not.
I also used a multimeter with the ohms setting with the ignition off, the harness gave a reading of 172.2, injector gave no reading.
So what should I do next? Thanks for your help!

The harness I checked was a brand new one I put on last week that made no difference in performance. I tried to check the injector itself but it didn't give a reading, I'm an amateur at using multimeters, I've never had to use them before, the wire isn't up against anything but the throttle body cover. I heard if there is no reading on the injector then it has an open in the circuit but I'm not sure. If the reading on the harness is high could it be the wiring? Thanks for replying!

I ran another test this time with a probe light, while the engine was running I connected the red wire of the light to the positive battery post and the light to the left side of the harness and the light lit up, I then put the black wire of the light to the negative battery post and connected the light to the other side of the harness and no light at all. So now it seems like a bad ground somewhere, what should I do next? Could it be a bad pcm or the wiring? Thanks!

So would I have to disconnect the harness from the pcm? I'm not sure which one it is because I tried to follow the wires from the injector and they go down behind the motor and as far as I can tell it goes into the top harnessvon the pcm. I thought there would be another connection harness between the pcm and the injectors but I think the wires go straight into it, not sure. I don't suppose that cleaning some ground wires would help. Thanks!

Ok I'm going to give it a try this weekend, I'll let you know what I find out, this is kind of new territory for me, I'm worried about bending the pins now that you mention it, I can't tell you how much I appreciate all your help, I feel like I'm really close to finally finding the problem, I'll get back with you this weekend with the results and see where to go from there, Thank you!

By the way I have a couple more questions, since I'll have the harness off the pcm to test it, would it be a good idea to try some crc contact cleaner on the pins? And would I apply the dielectric grease on the pins or around the pins? Thanks!

Im trying to get a reading on the pcm harness and Im having any luck, I don't think my multimeter pin won't fit down far enough to get a reading, I also couldn't get a readind on the pcm itself, am I doing something wrong? I took a picture of the pins and the harness to show you where Im at, is the battery suppost to be disconnected? Let me know, thanks!

Ok, I got a thin piece of copper and put it in the pin hole of the harness and it didn't give me a reading at all, I also had the battery disconnected, does this mean it's the wire? Thanks

I guess Im gonna assume it's the wiring since I didn't get a reading on the harness, I put it all back together after I put a dab of dielectric grease on the pins, it still runs the same. So should I be looking for a separate harness for the injectors or do they go straight into the pcm? Thanks!