Civic hesitation problem...
 

Buddy of mine just rebuilt (with all OEM parts!) a D16A6 with PGM-FI for
his '89 Civic (including the appropriate computer and wiring harness).
Got it installed, turned the key, engine turned 3 times... and fired
right up. Very nice. Idles smoooooth and quiet...

But when he gives it any gas, even just sitting in neutral, it bogs and
hesitates. Hit the gas too fast, and it just sputters and dies. Do it
carefully, and once it gets 1800rpm or so, it works fine. It also seems
to idle a little bit rich.

Thoughts? Ideas? He's checked for error codes, but it's not giving any.

TIA