help meh!!!!!

ok i drive a 93 civic coupe ex ,the engine was about to go so i swaped it for a jdm d15b


i used the ecu,headers,intake mani,tb from the ex engine .its been running fine for almost 2 months now and this is whats its doing



sometimes while idling the speedo will jump up and down by itself .


while driving somtimes if feels like the car downshifts

it also feels as if the car is shifting to early

also if you use the cruise controll
somtimes it will disingage and turn back on by itself


im thinking ecu ,i just need some help to avoid bringing it to the dealer friday.