I notice some of the suzuki engines now also have VVT (variable valve timing) technology

Historically engine valve timing in ic engines was always fixed and non variable and set at assembly or during timing

belt change while ignition timing has always been able to be altered and was integral in the tune up procedure

In fact any deviance from the correct vv timing moreover caused engine failure....(google interference engines)

In recent times manufacturers found the need to  also have the valve timing "adjustable:". This is generally acheieved

by an auto adjusting plate on the cam gears.

If that plate sticks or malfunctions then it will also give you the symptoms that your engine possesses. ie incorrect timing

a link below that explains VVT technology

http://www.suzuki.com.ph/index.php?option=com_content&view=article&id=1015:variable-valve-timing-vvt...

I have always found the forum below helpful

http://www.suzuki-forums.com/suzuki-jimny-sierra-samurai-forum/index3.html