T-VIS/ENGINE

[DJexor]

yesterday i went to mux to get me a new citylight and asked him to drive my hachi, 'cause i was always thinking my engine wasn't running well.
There is almost no power till 4800 RPM. When you kick the gaspedal with the economy meter green it goes faster than kick the pedal harder with the economy meter red. Look like the engine is getting too much fuel.
Above 4800 RPM it accelerates normal says mux.

Another problem. It uses between 1L/9KM and 1L/10KM gas when I drive normal. Mux had an economy drive this weekend (1L/15KM) and normaly it's something like 1L/12KM. When I use the T-VIS a lot it makes no different to the consumption.

Sometimes when I drive normal and get off the gaspedal, gas explodes in my exhaust. Look like it's getting again too much fuel.

When I checked my sparkplugs today I saw it was dry and said that the fuel ratio was a bit lean (Yesterday a lot of high revs back home from Mux.) So the ignition at that moment is quite good.

Is it possible that my TVIS is always open or my engine management thinks it's always open so it will throw more gas into the engine? What makes it very rich on fuel and no power because it gets too much gas till 4800 RPM when the TVIS really works?