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[mark.adams]

My miggy runs terrible on petrol, lumpy tickover and doesn't respond to throttle, although on LPG it runs perfectly, where should i start looking, presuming its not ignition as LPG is ok....
Any clues or pointers please?

[Kevin Wood]

I'd say either the petrol injectors are getting a bit clogged due to running on LPG most of the time OR the fuelling on LPG is a little out, and it has "learned" this characteristic, so the fuelling goes the other way on petrol. Does it improve if you run it for a few journeys on petrol only?

Kevin

[Jimbob]

petrol fuel filter in need of replacement?

I know a lot of lpg'ers keep their tanks very low, so may pick up more dirt?

[Martin_1962]

At least there is no issue as how often do you need to use petrol!

Clogged injectors - shove some BP or Shell stuff through, possibly injector cleaner

Italian tune up - always helps

Not fuel filter as idle is bad

Clean breathers as well

[mark.adams]

Thanks guys,
Is that correct that if it idles rough as well, its not likely to be the fuel filter??
Could the EGR valve be a suspect, its blanked off but i do get an emissions light on every now and then?
When its being a real b@st@rd, you can put your foot down to pull away and nothing happens, it just chugs until it finally either dies or bursts into life

[Entwood]

Mark .. most of your posts are unreadable due to the large size of your avatar ..

[Martin_1962]

What sort of LPG system is it?

Mixer

SGI?

Give it a service including plugs and take it from there

Could be airleak