So I'm trying to get my old girl through the emissions test to renew my tags. I've been through 4x now and although I've managed to reduce my HCs to acceptable levels, my COs are way high. They gave me an inspection check off report that I have to fill out and turn in next time I go through. The only thing different this year as opposed to 2 years ago was that I had a new muffler and tailpipe welded on. The Jeep was running perfectly fine before the tune up and Seafoam treatment so I don't have a clue as to why it's running so crappy now. I went over to Dugan's yesterday and we tried to figure out what the cause was but the only thing we found was a samll vac leak at the spacer plate between the carb and intake.
Here is the rundown on what I've done so far.
Tune up = New plugs (2x), new cap/rotor, new wires, new air filter, new fuel filter, new PCV, new muffler, new tailpipe, Seafoam in oil and fuel, ran a 1 tank of 91 octane through it, checked all and replaced a few vac lines, checked and adjusted timing to 9* btdc, tightened down valve cover (leaking)
Bypass attempts = removed air filter, removed PCV, added rubbing alcohol to fuel, pulled brake booster vac line (Jeep wouldn't run so I did not get inspected that way), adjusted fuel/air mix screws on carb (did absolutely nothing to help/hinder), cleaned carb and idle tubes
Symptoms (now) = running way too rich, erratic idle, sputtering/missing during cold start (seems to run okay when I get out on the main roads and up to speed), horrendous dry fouling on new plugs, will stall if the nose of the Jeep is elevated (speed bumps and driveway curb), a LOT of black smoke exiting the tailpipe
Specs = 1989, 4.2, 258ci, 6cyl, auto trans, Carter 2bbl carb (2-3 years old), Nutter Bypass (no ECU, EGR, O2, or fresh air pulse system), Team Rush upgrade (Ford cap/rotor and 8mm wires), Timing set @ 9* btdc
Please, Please, Please, any and all help will be greatly appreciated. I started this endeavour a month before my tags were to expire but now I've surpassed the expiration of my temp tag by a week and am running on borrowed time. I'm hoping they'll be gracious enough to grant me a 2nd temp tag today. I need to get this squared away ASAP as it's my daily driver. I will post up pictures from my phone shortly.