Jeep sputtering when cold
My 88 Wrangler 4.2 has a problem. When engine is cold, I get really bad sputtering at about 2k rpm, and black smoke coming out of the exhaust.
When engine warms up, problem goes away, and engine runs fine.
I figured this is carb related, but could it be the O2 sensor also? The carb is brand new, but could something be holding the choke in the wrong position? I just finished giving the engine a full tune-up.
88 Wrangler 4.2 5spd
33X11.50's, 3" lift.
Many exterior mods..