Do you have a check engine light? If you have a misfire on #4, it should set a light.
But, more to the point, you have to take it back who whomever "tuned" it up. Sounds more like he detuned it, and he's responsible.
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2005 Excursion XLT 4x4 with 5.4 3V & 4R100
1989 F250 XLT Lariat SuperCab 4x2 with 460 & C6
1987 Crown Vic Two Door with 5.0 & AOD
1986 Yamaha V-Twin Virago 1100
For my sanity, please try to use punctuation and capitalization. I try to help the people who post, but it's impossible to do when the post is indecipherable.
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will not pick-up speed 
Hybrid Mode
