Bentley is nice, but I think it perpetuates the same myth. If you do get one, search this site for the "Bentley Errata" so you can go through it with a red pen.

If it runs, but just richly, you might try some of the simpler mixture remedies before matching the AMM to the ECU, which is purportedly viable, according to that one TB poster. Rule out the temp sender by checking the voltage (warm) at ECU pin 2. This is the equivalent of the old "choke pull-off" fix you'd hear from Click and Clack in the old days. Rule out a stuck or torn fuel pressure regulator if you haven't already. Check all four plugs to be sure it is sooting them all equally.

That is all giving the benefit of the doubt to the AMM compatibility, regarding output curve, between LH2.0 and LH2.2. I can't tell you he's right about that, but would be pleasantly surprised to find out it is true. Yes the AMM is matched to the injector sizing, but there's an ECU with a fuel map in between!
--
Art Benstein near Baltimore

Remember what Cardinal Cooke once said:
"A man would do nothing if he waited until such time as no one would find fault with what he has done". - originally John Henry Cardinal Newman