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Re: Very rough engine from cold
Sounds like one or more cylinders aren't firing. That could be caused by a bad coil pack, or a bad injector that is leaking when the engine is shut off, and is fouling the spark plug in that cylinder.
The first thing that I would do is to pull each of the injector connectors off each cylinder to determine which cylinders are causing the problem. Once you have determined that, you may want to pull the spark plug and coil from that cylinder and have a look at them.
The ignition coils used on the SVX coil-on-plug ignition system can and do go bad. Usually, the spark burns through the plastic on the coil, and shorts directly to ground through the cylinder head instead of through the plug.
Alternatively, you may just need to replace your spark plugs.......
Jason.
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1992 Charcoal Grey SVX - 165,000km
1992 Ruby Red SVX - 165,000km
....now with sequential VIN numbers! 
1986 Holden (Isuzu) Piazza Turbo - 225,000km
1993 Mercedes W140 S500 Coupe - 153,000km
1990 Mercedes W124 300D - 313,000km
EG33 + 4EAT + VTD AWD = SVX 
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