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[Martin_1962]

Just been for a short drive, these codes came up after about 20 seconds before switching to LPG, and I was on a large amount of throttle.

0300
0305
0170 (or 0270)

Plugs changed last year
Runs OK not on full throttle, needed to restart to go back to 6

Thanks

Martin

[feeutfo]

0300 random multiple misd fire
0305 miss fire cylinder 5
0170 fuel trim malfunction bank 1

[feeutfo]

so on petrol?
check coil pack for cracks/damage or splits in the rubber boots etc.

got a decent maf on it yet?

[Martin_1962]

On petrol

Boots were OK when I last checked

Still on a £25 MAF

[PhilRich]

On petrol

Boots were OK when I last checked

Still on a £25 MAF

Does it run any better with the MAF unplugged Martin?
If no plug fouling or oil/water ingress, the plug itself is sound and tight & the Coil Pack rubber is ok, I can't think of anything else, sorry mate :-/ 

[Kevin Wood]

If it detects a misfire it will drop the fuel injector on that cylinder until a restart to protect the cat. 

Kevin

[Martin_1962]

If it detects a misfire it will drop the fuel injector on that cylinder until a restart to protect the cat. 

Kevin

Which is a nightmare when you need all 6