That was all? Not the 3.8 Pontiac beating cars that run high 12's or low 13's stock? Hopefully this thread can get Kimberly's car back up to snuff.
It is in NY; MasterMech is going to mod the muffler for me and do some other improvements. The Beast will really be a beast when he is finished.
Well have at it then Ill leave it to you, I'm sure your googling skills will get the car to where it should be
What code specifically is the car throwing for "lean mixture"? What code specifically for the egr? Dormans "fix" is known to throw egr codes because of reduced flow. Its a 50/50 toss up if it works it not. I wouldn't just throw parts at it, you need to diagnose. If the Lim is leaking you usually get coolant loss or contamination in the oil, but you already did it and they are common failures so no harm. The dexcool is fine as well if that's the coolant you used, I just run the cheapest stuff I can find. There is a "mod" of plugging the Lim coolant passages so no more coolant issues effect the upper plenum/ throttle body. I know someone who can google it for you. I haven't dug through my parts pile yet. I'd rather try to trouble shoot before sending valued parts. I have no problem sending a part but let's make sure it needs it. Po0171 is common for vacuum leaks. Low fuel pump pressure can cause it along with MAF or any metered air down stream of it(vacuum). Try and test fuel pressure. Since you are getting a lean code and egr code( coincidence I think not) I would start by having the car warmed up and spray around the egr tubes. They hold vacuum when the egr valve is closed. They are easily bent and boogered. Then spray around the UPPER intake where it meets the Lim.
I am getting the code PO0171 lean bank one. Lower intake had new gaskets; upper intake replaced with a Dorman. I am not seeing any EGR codes, just the lean bank 1 code. I thought I would throw a new EGR pipe at it and see if that is the cause. I did replace the MAF with a Dorman from Advance Auto. I am still waiting on the EGR pipe, which by the way is a Droman part as well.