Hi Everyone

My old girl is causing me agro when i start in the mornings it can go two ways good start or missfire start ,it can also be good for 2000 miles . Codes p0303 p0135 and engine light if i drive 500yards with the missfire stop lock the girl up unlock restart all is fine. all earths seem to be in good condition the car is dual fuel LPG so it starts on petrol
I have replaced Bank 1 sensor 1 . All 12 plugs have been replaced and a new air filter fitted