2000 Ford E-Series Van

Engine problem
2000 Ford E-Series Van V8 Two Wheel Drive Automatic 124600 miles

I have a 2000 Ford E-150 with a 4.6 liter and it has poor acceleration almost like converters are plugged but I removed exhaust and runs the same. I also put new plugs in it and performed fuel inductiion service.
The vehicle runs the same. When idles runs great but as soon as you accelerate it has little response. It will eventually rev up but when you drive it it is very slow to get up to speed. But does Any suggestions?
December 21, 2007.

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