P0401 and P0200 codes

[JDizzle]

Hey guys, I apologize if this post is not exactly in the right spot, I'm new to actually posting on forms. I generally just surf them in hopes i find my answers but alas I must come out of the shadows finally as I am stumped. I have a 99 gmc 2500 6.0 gas truck that has had a bunch of problems and I had to replace tons of parts and even recently had the heads machined professionally and the valves fixed. I finally got it all back together and the vehicle runs but the engine shakes very heavily and has a misfire on cylinder 7 and 5. I get no codes for a misfire but I know its there and have verified the cylinders via unplugging the coil one at a time and replugging it back in looking for the difference in the way it runs. I get the two codes mentioned in the title. A egr valve code and a injector circuit open code. The injector circuit does not say specifically which circuit and I have a feeling this may be important. So here comes the data I have collected through my tests:

 

Compression on Cylinders: Cylinder 1 compression at 180; Cylinder 2 compression at 150; Cylinder 3 compression at 180; Cylinder 4 compression at 180; Cylinder 5 compression at 180; Cylinder 6 compression at 180; Cylinder 7 compression at 180; Cylinder 8 compression at 180     ------      I have not done a leak down on any yet as I just had the heads professionally machined and new valve seats and valves etc which brought my compression numbers up from 130(vehicle was running with a misfire on a different cylinder before the machining due to a valve seat leak)

 

Spark plugs all new, have spark reaching them from the wire and obviously from the coil to the wire there is spark as well

 

Injectors all have ohm readings between 10.8 and 11.2, the injectors on 5 and 7 specifically were both above 11

 

Injectors Noid light test shows noid light not lighting up at all when ignition is on but engine not running

 

Injectors Noid light is flashing at the same pace for every single injector including 5 and 7 when engine is on

 

Both wires on all injector connectors are hot (shown by using a test light connected to the negative terminal of the battery) when ignition is on but engine is not on

 

One injector wire has a solid light and the other wire shows no light at all( not even blinking ) when engine is on and this applies to all injectors (this test was again with the test light connected to the negative terminal of the battery)

 

as apart of the process of diagnosing all injector connectors and wires etc I unplugged injectors one at a time, tested them, and plugged them back in. The only cylinder this seemed to have caused a problem on was cylinder 5. Originally for the bulk of the testing cylinder 5 was firing normally and only 7 was misfiring. When i unplugged injector 5 and tested it, I plugged it back in and the engine did not return to the single cylinder #7 misfire but rather kept misfiring on cylinder 5 as well. I since retried connecting it and I retested the injector and the connectors etc and got the same results as previously mentioned so nothing changed except that for some odd reason cylinder 5 misfires too. 

My reasoning tells me that it does not make sense for this to be a clogged injector(why did 5 suddenly stop firing after only being disconnected a short time) as they all have about 1k miles on the injectors. Thats it. They are practically all new.

I have not yet used a mechanics stethescope on the injectors to see if i at least hear clicking on 5 and 7 but I plan to do that tomorrow. I also could perform a leak down test but the heads were just professionally machined and dont even have 30 minutes of engine running on them + my compression is pretty damn good. I would expect at least slightly lower compression if a valve wasnt seating or perhaps my rocker arm was tightened too much etc? Thats not even the cylinder with 150 compression and the cylinder with 150 is firing just fine

I also stumbled across a crankshaft relearn process as a possible fix or a crankshaft sensor as a possible fix but those both seem like a bit of a stretch. And since I don't have a distributor and its coil overs I dont see how the firing order can be messed up. I also never messed with the timing so that should be fine(in the block cams)

 

I know this is a lot. Im just at my wits end now. ANY help is appreciated so so much. 

 

Thanks