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automatic or manual transmission?
OK- normally you should replace the fluid and filter every 40k miles or so, have you done this recently? When you drop the pan you can inspect for any particles or metal flake, which would indicate whether you have normal wear or a breakdown in the material in the clutches. Does your engine rev without the transmission keeping up, as if it is "slipping"?
what engine do you have? The 4.2?
OK- so no in-tank fuel pump. Have you replaced the fuel filter? There should be a one-way valve in the system to keep it from bleeding all the way back to the tank.
If the transmission filter was replaced, then the pan would have been dropped- you weren't told of any problems at that time? ATF level is OK?
What do you mean by "unnecessary" vacuum lines? Did you plug off the ports they come from?
If you removed the WOT throttle sensor, it's not going to know when you are kicking it down to pass