changed plugs rotor and cap. main relay is intermittent on bench test, will that cause the engine to run rough. when i had a fuel pressure gauge hooked up sometimes it would not show pressure when the key was turned on then after on/off cycles it would come on. driving the pressure was good or the gauge said it was? but i noticed the ignitor is also controled by the main relay. i jumered the 5 and 7 and the fuel output in a can was very strong. any ideas as to what to check next?