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I recently acquired a 1990 Olds 98 with less than 100k miles on it!! I had to replace the crank position sensor on it. It runs perfect. But, it is running rich as all heck.

It has new plugs, wires, and coils. Perfect compression . How can I lean it out? Or, should I?

Thanks in advance
 

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Sounds like something between the MAF, MAP, and front O2 sensor not making the right decisions/readings... Or the fuel system is over-delivering via a stuck injector or regulator? You can check pressure at the rail, and maybe grab another set of injectors at a yard to try cheap, before paying to get yours serviced. For the sensors, I'm not sure the best route to go without full-on replacing until it's fixed. OBD1 is a bit of a pain, but glad you got a crisp model from that era.
 
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