I just put a JDM B16A in my car and have a surge/slight miss/flat powerband feeling at lower RPM's (100-2300rpm's). I have just the common three bolts and high RPM seems fine. I was told (by a mechanic) that it 'could be' the throttle position sensor going out. Thought it would shoot a check engine light....but maybe not. It just may be on its last leg and I'm noticing this weird feeling at low rpm b/c of it. Its a JDM motor so it could have been sitting for a while and I need to flush the system (I have cheap 10w-30 for now and plan on changing the oil this weekend) ANY ideas????