I'm sick of this stumbling, bad gas mileage and poor running conditions and not being able to diagnose it myself, so I took it to a local shop here in Marietta, GA, called Carburetor Specialists. They've been in business for 30 years and all they work on are carbed vehicles.
Excellent reputation from everything I've found out and they're intimately familiar with tuning Honda & Toyota's carbed cars.
Anyway, what I found was that the PCV valve and other easy fix stuff was all fine. From what they've told me, the "circuitry" in the carb is bad and that to really fix it properly, the carb needed to be replaced with a rebuilt unit, tuned properly and the timing needed to be adjusted. He indicated that it was somewhat retarded causing a rough running condition, poor acceleration and bad gas mileage.
The cost for diagnosis, labor, carb and timing job is going to be about ~$600. I told the guy that I could get the carb online for about 1/3 less than they were charging, but he convinced me that they do a better job locally rebuilding them and provide a 12 month guarantee on workmanship, labor, etc. I bit...
It's a chunk of change, so it sure better make a hell of a difference in performance and gas mileage.
their website is www.carbspec.com
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