VT-Engine miss's under load @ low revs

[sportyclansman]

When cruising at 100 kph then encountering a hill, the engine starts to pop & fart. I have to try & give it more to make it kick down. My fuel consumption is shocking. I tried replacing the spark plugs, the leads & even got a replacement coil which I alternated with the existing ones without success (thinking that 1 of them was breaking down).
Someone has mentioned it could be the ignitors. Where are these located?
By the way, I have a direct injected LPG kit & I run it on gas 90% of the time, the effects of the engine missing are a lot worse on gas compaired to petrol. I guess its just the bang caracteristics of the 2 fuels

[commodore king]

i had the same problem with my vx but i changed the plugs and leads but the problem went away maybe one of the gas injectors maybe blocked abit

[sportyclansman]

It seems to run smoothly under acseleration though & I dont think its a gas issue as ive switched it over to petrol & the same problem is there.

[commodore king]

yeah that doesnt sound right did u change all the coil packs ?

[sportyclansman]

I did 1 at a time, when there was no change I changed it over to the next 1

[commodore king]

id try with all new ones or maybe get the computer scaned to see what fault codes have come up

[sportyclansman]

I had another look today & I think what I thought was a miss is actually the motor running slightly retarded. Im gonna get it scanned but I think the crank angle sensor might have gone.

[immortality]

what spark plug gap you running? have you tried a smaller gap?

[Glenno]

I had almost exactly the same problem you mentioned in my VXII V6. Took all the plug leads off and re-attached them and it went away! Don't really know how it fixed it, but its gone! Was doing it for nearly 12 months and had it looked at twice by Holden with no success. Hasn't been back since!

[TUF UTE]

would have been bad spark on yourss glenno, you just got lucky.... if you keep driving yourvt like it the way it is its probably going to blow a airbox soon

[banga]

whats an airbox?

[TUF UTE]

the thing the airfilter is in , im guessing your not to familiar with cars mate... best to just take car to a mechanic and get them to look over it, pref. gas mechanic

[fitz_vt]

your car seems to have too much air to LPG or Fuel mixture take it into your local mechanic for a tune, and maybe a bit of a service..