I have a burning rich cold problem I can not find what is wrong. I have sprayed the entire engine looking for vacuum leak, none. I have changed the coolant temp sensor. Now I'am looking into the performance chip. This engine is listed in real OEM to to be the super ETA (valve size anyway) what ECU is supposed to be in this car? It has the 153 ECU in it now. I was told that a chip is not made for that engine. It was chipped (told)when I bought car. Now I think that could be the rich burning at cold start. won't idle and smokes until warm up. Anyone know some of these answers? Thanks