I finnaly found my hesitation/ stumble problem. This is what i did. not to throw parts at it but I tested each senor/component. the egr was replaced cause it did not hold any vacuum, plus it was clogged full of junk. smart thing to do when removed is start the engine and bring to 1000 rpm to push out any carbon. fuel pressure test and everything ok, but the fuel pressure regulator didn't hold vacuum either. all injectors tested fine, but good to test for spray pattern. i did replace the opti, i took it apart and noticed it carbon tracked, plus the terminals were pitted. engine does have 130000 on it. and new water pump, cause i was already there w/sensor. new tps & iac. worked good but since i took ogg the throttle body to clean, might as well. the computer ground i sanded the connector at the bolt, plus the bolt. corrosion can and will affect performance, and the power junction. new plugs about year ago along w/wires, but i saw two wires resting on my header, # 5 &7. o2 sensor were replaced, but i had them for a while but never put them in. good time as any. and the igntion control module. one problem i di come up w/is when the car got to 220 and trumped on the gas the engine would cut out. i think the mass air flow sensor or the iat senor could get heat soaked. one thing i did to eleminate that problem is hooked up the low temp fan switch. the car runs all day long at 194. and i can floor w/no problems. i have to look closer at those two sensors later. SORRY for post SSSSOOOOOO long but i know there is alot of people w/this issue. hope i helped some. let me know. oh yeah it runs *** smooth as glass now......WWWWWWWWWWWWWWWHHHHHHHHHHOOOOOOOOOO