Ok, my ecu took a shit a while back, so got another one from the boneyard, but it was '93 ecu, so i switched the wires as per the vfaq, and it seems to run ok, except for 2 things, one, it has idle surge, but only when coming to a stop, if you have been stopped for a while it idles normal. second thing is that if you press the throttle more that about 1/4 throttle the tach starts to bounce around, decreasing eventually to zero when you get to WOT. My question is that the 90's have a different power transistor correct? if so, could that cause these problems, other than the idle surge and the screwed up tach it runs great. Thank you.