What do the plugs look like ?

If they are sheet white - you probably are loosing a fuel pump. You need to plumb a gauge inline where the fuel lines are, right below the intake on the driver's side. There is not tap, you will have to get a fuel pressure gauge and some brass fittings to make a t-assembly to monitor fuel pressure.

If they are black then you are loosing a coil or have a cap/rotor problem.