The difference between the two wouldn't be worth it.. if you running rich, check your fuel pressure and 02 sensors.. The 180 rather than the 192 won't cause the system to run in cold mode. a 160 will have it run in cold mode, the 180 wont. How do u know that its running rich? what do you plugs look like? if there amber or white then your running just fine.. if there fowled and black then there not.
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