265k miles. No engine codes except O2 sensor. No misfires. This started a while back, it would run great but start acting like its running out of gas. RPM's would begin to fall, start pressing the accelerator & it takes off until you slow down & then it starts all over. Now it does it about 95% of the time & the idle has gotten rough. I have cleaned the throttle body & EGR passages. Replaced EGR, TPS, MAP, IAC, fuel pump, ICM, dist cap, coil, rotor button, fuel pressure regulator, plugs, & wires. All of this over the course of 1.5yrs hoping I would fix it & its just gotten worse, to the point now I dont drive it at all. Anyone have a clue what my issue is. HELP