I was driving in traffic and my 93 RR County LWB 4,2 just died on me. First I heard a noise like a flat tire from the rear (i was going 70mph and it was a somewhat faint sound that lasted only a few seconds-was it a relay fluttering?) then it hesitated/bucked a couple times, drove ok for 1 minute and just cut out. All electrical was there but no motor. I coasted to a stop and got a tow.

I have spark at the spark plug lead, new coil, all coil, pickup and amplifier tests per the RR shop manual test ok. I tested the fuel pressure by putting a gauge inline between the fuel in line and the return line and clamping the return shut. I am well over 50psi. I have no where else I can test that isn't rusted. I have power at the injector but no pulse. I've hooked a voltmeter up and a test light and neither do anything. When i crank it it just cranks...no attempt at all to turn over and no signs of combustion.

Because i have spark and i'm thinking the injectors are not opening, is there some sort of crank timing sensor or something that may be telling the ecu to not open the injectors. What about the MAF? I'm pretty good at FI diagnostics but this one has me stumped.