This car has 30,000 km, it starts well linear and is fine in walking, but when it is hot at idle it loses steam and gives me error P1336 misfiring.

I should mention that it had pump and all sensors clogged with belt residue, which also gave me resolved circulation-related errors.

Changed fouled spark plugs. Is it possible that it is a few degrees out of phase and can give this annoyance?

When the error is cleared, the stain returns linear for 10 minutes and then the error returns.

Thank you