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Car just passed inspection ( thank you Jesus) but mechanic says car is running like crap (it's really not that bad just a rough idle once in a while). He measured the convertor temperature (450 degrees) and after the convertor (280 degrees ) so both he and I think the convertor is starting to...

Scotty Kilmer on You Tube claims lacquer thinner added to the gas tank will clean a catalytic convertor. Anyone try lacquer thinner? I won't ruin the engine will I? Paul

Full story; 1975 Chrysler New Yorker, 440 engine with Holley spread bore. When stopped at traffic lights the engine will idle very smooth in Drive (so there's a load on). Idles almost like it were fuel injected and you can't tell the engine is running. But then sometimes the idle will degenerate...