I recently swapped a d16z6 into my 93 vx. I got the vehicle running, but the problem is it will not pass smog. It is burning too much HC. My spark plugs keeps getting fouled. I was just wondering would a chipped ecu make my vehicle run different and cause it not to pass smog? Second, how can I tell if my ecu has been chipped? I've changed every sensor I can on the vehicle and it is dumping a lot of fuel.