I just completed a na to tt swap. We spapped in a 67k jspec complete moter , trans wire harness and all the extra stuff off of the front clip. My ? is we are getting a rough idle and hesitation stumble off of idle. We adjusted timing , idle and trottle position sensor. To no avail. We then put in my na mas and it is running right. My real ? is there a signicant diffrence between the na and tt mas? I would rather not buy a new one rright now if it wont hurt anything. P.S. there is a K and N pop filteron it. Thank you for any and all of your help