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UPDATE: My local salvage yard had a 50% off sale last weekend so I pulled some coils, and a maf sensor out of a 97 continental. The car was running rougher and rougher everyday until the computer finally spit out a code for cyl. 2. I replaced the coil and sensor and all problems went away! Must...

Thanks for the responses guys. Just to clear some stuff up I cleaned my maf sensor last week. CEL doesn't come on till about 100 miles or so after it's reset and no, it's not quicker when I clear it. My plans are to install a K&N filter, and a fuel filter change and see what happens from there...

Curious if my 97 Mark VIII LSC is making the full 290 horsepower claimed from the factory. It has 150k w/ no problems. Check engine light is on because the cats were gutted by the previous owner (no burning egg smell or anything like that). Even when I clear the check engine light my car does...

So if new O2 sensors don't fix my problem what would you recommend? Could this be a COP problem or something else? I thought that new O2 sensors would stop the engine from running rich but maybe that's not the case. Thanks

Looking for some advice on my 97 Mark VIII LSC. it almost has 150k and just recently, it's been hesitating a bit at lower RPMs. Check engine light is on, and it spits out codes 0153, 0420, 0430, and 1151. After researching these it seems there is a problem with my cats, and possibly with the O2...