For the last 2 weeks, every now and then, the engine will spin over, but won't start, I've checked everything, last night it would not start again, so I turned the ignition key on, heard the fuel pump cycle and the waited about 1 minute or so, and it started right up, it ran ok but was a bit sluggish at 55mph.....could I have a bad ecu???? or a faulty relay in the ignition...I have good fuel distribution, and no codes come up on the car or my OBDII....please send me in the right direction...it's the only car I have to get back and forth to work with.