Welcome! It's always happy to see a fellow VX.
My VX hesitates as well when I hit the gas, but not as badly as yours. I still haven't ordered my o2 sensor, but given the number of miles and the general neglect my car has had over its lifetime before it came to me, I shouldn't even hesitate to get one, right!? (I highly doubt it's ever been replaced)
I never gapped my spark plugs. They looked about a millimeter. Do they not come properly gapped out of the box? I'm using the NGK ones advertised on the car as the preferred spark plug.
About your lowish mileage Alain. What kind of driving do you do? If you could give a detailed account of the sort of terrain and length of trips and speeds and traffic you drive in, that all plays a significant part. At what RPM do you shift from 3rd gear to 4th for example? In third gear when I reach about 1600RPMs I shift. Sometimes sooner. About 1400RPM from 4th to 5th.
1st gear - 1800 RPM (or 11mph)
2nd gear - 1800 RPM (or 20mph)
3rd gear - 1450 RPM (or 25 mph)
4th gear - 1350 RPM (or 31-32mph)
That seem about right TomO? Any other VXers wanna weigh in on this?
I think I'm getting in the upper 50s Alain, (with no mods to the car and non LRR tires) although I'm still not certain about my mileage because I haven't done enough tanks yet.