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its prety random doesnt really happen at any certain revs ,sometimes at 2000rpm ,then tonite it changed up and was just flat at 4500rpm like i wasnt moving ,dont understand it makes my rx7 seem very slow lol

i have an 92fd auto and one minute u put your foot down and it takes off like a missile and the next minute it is really flat its not the kick down as that fine its like there is no boost any help please

right brought this rx7 92 auto a few weeks ago ,came fited with hks super dragger apart from that its standard ,since then i have fitted an arc induction box and a custom made smic made by pace ,now im just wondering what other mods i can do without having to go mad ,also i hav a knocking coming from the back not whenim going over speed humps ect only when engaging drive or moving very slowly and touching the brakes any help will be gratefull
 
thanks