I have a '98 with the 3.8 and it is giving the crankshaft position sensor code (P0336). What problems might this be indicating? Anyone know of any fixes?

Thanks,
Scott

Poor or interupted signal from the cps, this can be caused by the sensor itself, the connector and/or wiring to the icm and pcm.

Are there any mechanical problems that this may be indicating?

It can and will cause stalling and missing as it gets worse. Could progress into a no-start situation if left unattended. The crank sensor is what the PCM uses to fire the spark plugs at the correct time, adjust timing advance, fuel delivery, etc...