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I have a '94 Mark VIII and am having trouble with the check engine light, and idling. The car sometimes does a bouncing on the RPM's when idling. I pulled the codes and got a 538 which my books says is "unable to control RPM's", and a 214 which was "cylinder ID failure". I called Autozone with these and asked if it might be the throttle position sensor. Their manager said he thought it was the crankshaft postition sensor so for $15 I tried that. No luck. On a side note, I have replaced the O2 sensors, and it has newer FMS 9mm wires and new Autolites. Any suggestions on what I should try next? Thanks in advance for any help!!!!

Matt
 

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I'm not sure if this will help or not but try cleaning your MAF sensor. There is an article in the articles section of this website that tells how. :) That might cure the idle fluctuation. I have no idea where to tell you to start looking for the cause of the cylinder ID failure problem. Maybe the cam sensor(s)?
 
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