93 taurus cutting out 3.0

going down the highway my taurus cuts out like it ran out of gas.As I,m pulling over to the side and slowing down it comes back to life and seems to run smooth but acts like there is no connection to the throttle.This happens often but not always.codes are showing 528,536,521 which may or may not be connected to this.It always starts up but does seem heavy on gas lately
any ideas? Thanx

521: power steering pressure switch issue,, code says no indication of change during koer code test,, when running koer test, you must turn wheel at least 1\2 within a few seconds of engine id code being sent, senses pressure change at power steering unit, pcm looks for this to increase engine rpm when needed, I'm not sure if this is available on all models, some may exhibit this code, but not have the actual switch, in that case disregard it
528: make sure your a\c is turned off, during koeo test, if on, could generate codes 67\528,, happened to me one time with my 87 Taurus, left the a\c switch in a\c mode, got the 67 2 digit,, yours will be a three digit code such as 528, or it could be trans related depending on model, clutch pedal position or park\neutral position sensors
536: has to do with the BOO circuit, brake on\off, pcm looks for this, either it wasn't applied during koer test, or something in the circuit has failed, could be bad ground, bad stoplamp switch, etc.. doesn't really sound like any of the above are connected to your problem of cutting out unless it's in a big roundabout way?? BOO circuit??
I'd start with checking fuel pressure, filter changed recently???, pull dist. cap, clean rotor and cap, they're probably corroded up, check all your vacuum, electrical connections, many miles on this car?? any black smoke when this happens?? Sort of shortened up the code defs, took them off my disc,, koeo= key on engine off,, btw, koer= key on engine running, just in case.

thanx for reply! car has 75000 miles,fuel filter has just been replacedno black smoke that I can see.I'm going to make up a gage to read fuel pressure nad will clean dist cap.Could this be the pickup in the dist? and how would I check
Thanx Ed