Perhaps rovin4life can tell you what a dealer or indie mechanic would check first. Here's my recommendation.
Now that you have solved the spark problem, you have revealed problems with fuel/air mix. Good news is you did fix a significant problem that wasnt going away, and you did it yourself so you saved cost. Now you are able to detect the next problem.
Possibly the unburnt fuel from the bad coil caused problems w O2 sensor etc... or the two problems could just be coincidental.
Possible problems are:
-Mass Airflow Sensor (considertaking the MAF part of the intake plenum out and spraying it with a cleaner, then make sure its perfectly re-connected so there are no air leaks - ultimately MAF sensor may need to be replaced. i think its common with some GM cars so don't rush out and buy from Rover if you don't have to)
-Manifold Absolute Pressure Sensor (check for vacuum leak)
-Air intake leaks (make sure you got the intake manifold and all supply ducting perfectly re-installed)
-exhaust system leaks
-a problem w secondary air injection
-o2 sensor
-Engine Coolant Temperature sensor
-fuel pressure: pump, filter
-fuel quality: bad fuel
-and yes... injectors
The fact that both banks are running lean tends to argue against injectors being at fault. fuel pressure could be low - when was last time the fuel filter was changed, if ever? I'd check for airleaks around the intake manifold since you may have removed that to replace the faulty coil, and I'd check whether the MAF sensor needs to be cleaned (i cleaned one on my wife's S420 with brake cleaner, but check what the autoparts store recommends).
If those ideas do not do the trick, unless you have a scan tool that supports more in depth analysis, and a multimeter, and a lot of experience troubleshooting rover engines, at this point I'd take it to a good mechanic.
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Pat Herman
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