The smog pump is a pain at start up. Also on my 300 I needed a fuel governor or something . It was around 200 bucks to fix. It was, I believed, somehow attached the accelerator. A brand new one of those fixed the problems right away.

My 420 has never failed inspection. I did, however, have leaky fuel pumps / injector which needed replacing. No big deal. Good car.

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'89 420 SEL
'90 300 SEL
'68 Olds 88 Convertible
'84 300 SD (sold it)