I replaced the fuel filter. Will check timing tonight. The stall-on-deceleration problem is apparently gone, now it idles (after the rough warm up time) at 2500 rpm! I only have a homemade fuel pressure gauge with rubber hoses, so I couldn't attach it to the fitting at the throttle body to test pressure. The Hayne's manual says there's no procedure to adjust idle (controlled by ECU?), is there a screw to adjust for a baseline idle setting?