rough idle for 30 secs on first start of the day

91 Mighty Max injected 2.4 idles real rough for just a few seconds. if i step on gas a little it will smooth out. Only does it first start of the day. Also noticed running a little lean (white tips on electrode of plugs). I see so many different posts but none have the exact same symptoms. Remember, once i get out of my driveway, it's fine and only after it's sat for many hours.

I've had a similar issue on my MM 94 3.0L. It ended up being carbon buildup on my throttlebody valve. Carb and choke cleaner fixed it right up.

Cleaned TB and EGR but no change. Someone suggested O2 sensor for lean condition. Does this make sense? Lean cond fix is most important to me for now.

ended up being a dirty connector plug to the IAC.