So my Dad picked up his Camry 96 2.2L (no O2 sensor) at GreenFuel last thursday. Using the SGI with no O2 sensor since na recommend to observe muna daw the car.

The next day while driving along SLEX going to makati my parents the engined stalled. He was running on LPG. So he pulled over to the side and tried to restart the engine. It wouldn't respond. Then just about when he was going to go out, he tried it and it started.

He went back to GreenFuel supposedly to have the O2 sensor installed and hopefully the car performs better. It was just adjusted again with no O2 sensor installed.

On their way back home to alabang along SLEX again the car stalled again. =(
He was able to start it up again after a few minutes.

I was then able to test out the car. Starting it up on gas and then transistioning to LPG was fine. I couldn't even feel it. The acceleration to about 60kph was fine but I can feel I can't push it to accelerate like gasoline.

I then tried to run on gasoline. The weird thing is from idle the engine will start kinda like choke and feel the engine really having a very hard time. VERY ABNORMAL.

My dad then decided to fill up the gas with High Octane gasoline to lessen the Octane gap between the Gas and LPG. (Hunch niya) He's also planning to change spark plugs. His filter is pretty new so he said that can be it.

Here's my question. If the SGI is supposedly an ADD ON to the system then why did the car lose acceleration POWER running on Gasoline?
The A/F mixture for the gasoline wasn't tinkered with right? Only the A/F mixture for the LPG are being adjusted by technicians?

So my dad is hoping this gets fixed and he's actually willing to pay for the additional O2 sensor if it'll get this problem fixed.

I have some hesitation though that even if the O2 sensor is installed, the car will still have problems.