Its Friday night,I've had rather alot to drink but I from what I see of your problem its nothing more than a change of camshaft sprocket needed.The spokes of the sprocket are what the camshaft sensor reads to determine #1 cyl at TDC to enable sequential injection.If you look at the sprokets for Gems and Bosch they are very different.Quite common here in the UK for pre99 motors to get swapped with post 99 - esp as values drop and garages do what they can to keep costs down.
I first worked out what the problem was about 4 yrs ago by scoping the cam and crank sensor together because the car's Motronic ECU continually logged cam sensor faults.It was interesting because the ECU did a good job of trying to make sense of the incorrect readings it was receiving.
Worst thing is the amount of work to change it.
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