I removed and capped the AT, ACC and EZL ports - no difference. Hoses are flexible and no visible cracks. The car was tuned to pass CA smog at an indy < 4,000 miles ago - I'm sure he would have said that it needs an O2 sensor. It could but it doesn't run any worse now than then. I was too cheap to have him run a proper diagnosis
Less than 500 miles since new valve seals were installed. I haven't checked EHA current and duty cycle yet.