I have read codes before and now following the procedure in each socket, i am unable to get the lite to flash anything, even after pressing the button for a second. The check engine lite in the dash does not lite when you turn the key to the "on" position.(is it suppose to?) On a trip last weekend the check engine lite did come on for a short time, only to go off after a stop. The car is running rough on idle, hestitates on acceleration, and seems to be low powered at high speed, so i would expect to see something to show up. New fuel pump installed within 3 months, car ran fine after that. New plugs, wires, cap and rotor installed with no change. Did find a collapsed vacuum hose, replaced and it ran good for a while. Now symptoms are back and i am trying to locate all vacuum lines and connections. Thanks for any help/suggestions anyone can provide, phil