Today i was on the freeway and a ford f150 harley davidson pulls up and steps on it so my freinds said take him i said ok i stepped on it and went full boost to 22 what it is tuned for and all a sudden it dropped to 15 so i pulled off the freeway and nothing was wrong all pipes and couplers were on so we started driving again and i went down a side street and launched it and stayed full throttle and it did it again and i have no clue why cause it has always stayed 22pounds no matter how hot it is out side or gas i put in any one got any sugestions. thanks

 

boost leak test time. Could be the throttle body leaking

 

check for boost leak again, and check your MBC.

 

sounds like a mbc issue...check to see if ball is sticking

 

OP, so what was the final issue causing this? It just happened to me last night.