EGR/misfire issue

Okay. I am cleaning both ports where the EGR mounts to. My speedo cable isn't going far into the passage yet. I do see some black coming out though.

After I cleaned the ports as best I could, I blew air through both ports and ran the engine. I didn't test drive it yet but will tomorrow. It now sounds like it has a slight knock. Should I change the oil soon if it isn't just low?

It doesn't fall flat on it's face anymore but does still shake at stop signs and when accelerating at different spots. I did have a squeak that was in a pattern when starting up the truck and until the engine was hot like a pulley noise or something. Never heard it before. Once I drove the truck some just now it went away. Maybe just an oil change will help? I did put a little Sea Foam in the oil too.

The SEL is flashing again even though it is running much better. I will have them reset codes when I buy oil and a filter.

They wouldn't reset codes saying they have in the past and the customers car wouldn't start. I did have them read current codes and have cylinder 2 misfire and high voltage temp sensor (it was just changed). When I drove home is was clattering metal in the top or bottom of engine like it has a bearing or something else seriously wrong.

I'm afraid of moving it much more because I don't want to destroy this engine.

Thanks so much. I'm not a mechanic and you've helped me immensely. Sorry if I've tried your nerves at all.

I made a mistake which caused the massive knock.

I now still have a knock and it is not all the time, but biggest problem now is when truck is in park or gear when stopped and engine is warm the rpm will fluctuate from 500-800 then smooth out back and forth. When engine rpm goes down to 500 the knock is worse then the knock gets a lot quieter when rpm evens out. Do you think a bad EGR valve or a messed up gasket could cause this? The truck also has a vibration when in park or gear still.

So, before I did a top cylinder clean with a cleaner it wasn't knocking. Is that the source more than likely?

I did an engine flush and got a bunch of grit in the oil when it drained. I do not know what else to do besides have it looked at which I cannot afford right now. When I put in the oil I added a quart of MMO. When I start the engine it knocks loud for two to three seconds then quiets.