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Thanks for all the replies!! I didn't realize this post was gaining so much traction.
So I found the solution, and it's a lot more embarrassing than all the suggestions put forth... Turns out the ignition wire to cylinder #2 was not connected properly. I reconnected it and simultaneously swapped the Lambda ECU with a one from a '83 911sc. Car idles/runs great! Hooked up the afr meter at WOT and it shows a perfectly flat 14.7 when idling.
Put ~200 miles on the car since rebuild, really pushing it at times for proper break-in and to ensure the rings seat. Just did a compression test today and all cylinders show 175 - 185psi, (installed 10:1 P&C set with 964 cams). So I think I'm good on that front.
However, now I'm running into something else odd... When starting the engine cold, it takes a bit for the engine to start (turns over 3-4 times prior to starting). After that, it'll start up immediately in each consecutive start. I also noticed that the first ~5 minutes of driving when cold, it is reaaallly sluggish in accelerating. Plus, it will drop to ~500rpm when letting off the acceleration... From what I've heard, it's acting very rich when cold (smells rich too).
I disconnected the O2 sensor and got the car to WOT, it shows a consistent ~13.0 afr. Got a Gunson gas tester and it shows 3.0 - 3.2 CO %. Which is more rich than the manuals suggest. We don't have emissions testing here, and I'm not concerned about fuel efficiency, so I figured that's right where I want it.
Is the sluggish to start up and accelerate when cold a normal behavior? Once fully warm, it drives and accelerates great.
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