Rough Idle, highway stumble, P0402 code

Greetings, I've got a '95 Tacoma with the 2.7L 4wd and 241k on the ticker. Shes slightly lifted on 33's and I've been having issues for a little while now. It started with a slight stumble / rough idle every once in and while and its progressed. I've put off scanning it because everyone automatically assumed it was an OBD1, but I finally got time to get it scanned and got the following codes:

P0170
P0300
P0301
P0302
P0402

Which is an array of issues, but more importantly its definitely black smoking worse than usual. Its not noticeable on anything but my truck bed right above where the exhaust exits (it has stock exhaust). So its easy to assume some sort of EGR culprit, but before I go throwing money at the issue I was hoping this was a common issue and fix? Thanks for any help guys.

 

Have you ever had the valves adjusted?

 

I am the second owner of this truck and I got it around 196k, the original owner bought it new and unfortunately passed away. But he was impossibly thorough with maintenance on the vehicle. The only thing that is odd is there was a rough idle before, but the stumble seemed to appear post tune-up. I used napa wires, plugs, coil, disty cap. My first assumption was crappy cheap plug wires/cracked tubes, but I wasn't expecting the P0402 at all.

 

Also, the codes are in that order when scanned.