2003 2.3 XL 2wd 5sp 280114miles i am the second owner and it had 60000 on it back in 08 has always run great till now stumbles at low speed or when i need to get on it like up a hill? new plugs,wire,clutch,air filter,oil change,clean throttle body,mass air,new tps, fuel filter checked fuel pressure and no intake leaks that i can find ! please help and thank you in advance

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mistretta24

Try unplugging the MAF - mass air flow sensor - to see if 'table' values work better than live data. If it is not working properly, but 'working', it may be sending bum data, so the compute doesn't provide the little extra squirt of fuel needed upon acceleration.
Hesitation or stumble on acceleration is often a MAF caused problem. Second cause is fuel pressure not being diddled as needed, either flow problem, or regulator problem. The regulator or driver, depending, will jazz the pressure upon acceleration(like the compute previously mentioned), and the bumped pressure will shoot more fuel per time period open. A slowly strangling filter, dying pump, fiddled driver(PWM operation to regulate pressure), bad wiring(amps),etc etc etc can also add to the soup.
tom