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Old 02-03-2019, 05:23 PM   #4
ak-
R3V OG
 
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Join Date: May 2009
Location: Hacienda Hts, CA
Posts: 12,406
Sounds like you're looking for preventative maintenance. Luckily M10's are easy to work on.
Replace all the fuel and ignition components to start as well as the 02 sensor; plugs, wires, dist. cap, rotor, injectors, fuel lines, vac lines, etc..
Find out what the numbers were when it 'barley passed smog' to give you an idea of what's going on. If the cat is just as old as the car, that would be the first obvious guess.

Another piece of advice is the old saying of if it's not broke don't fix
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