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It's very sluggish

Ford F-150 2000  200000 miles
It rattles and it's very sluggish, as if something was missing. I changed the oil filter, spark plugs, cleaned the throttle body and it's still the same. The spark plugs I used are normal cheap ones, not platinum, and I calibrated them to 0.52, now it starts quickly, before it took a while. What can I do so it recovers acceleration and feels quick again?
indie from United States 9 years ago  
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Best answer (according to indie)
Raymond from United States 9 years ago
You have to check the gas pressure in the fuel rail, this is very delicate and with a few pounds everything is already off. I had that problem with a King Ranch that didn't go over 70, I changed the fuel pump and that was it.
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