Sir, I put up with the exact problems you describe for years.(?) I installed a new accumulator and it did nothing. The problem persisted. After a short consultation with my Houston "guru", the problem is solved. There in the engine compartment, left forward bulkhead, near the compartment light, is a ceramic "capacitor" thingie. Has wires coming off both ends. Remove them, put them back on, remove them, put them back on, wiggle, wiggle, wiggle. My car has performed flawlessly since that time. My car sits alot, has ince I bought it 20 years ago. So I think it is a corrosion problem; all gone now! MHL