Only if they are clogged and creating exhaust back-pressure.
Pratt & Whitney nine cylinder radial engine
Probably not. They would have to be clogged solid not to let engine idle in which case the engine would not run at any speed. If they were semi-clogged the engine would idle but hold engine back from revving up.
The engine will have difficulty in performing correctly!!
the engine wont start
The engine Will struggle to get fuel.
clogged up catylatic converter.
Yes, if to many of them are clogged, if only one or two are completely clogged the engine will run rough. Also replace the fuel filter.
fuel filter clogged fuel pump weak fuel line clogged