Hello, This is in response to the "Hesitation" issues on my '92 3.3 century with sluggish power/hesitation that started at just highway speeds..and now has progressively got worse with no codes and barely drivable @125,000 miles. I changed ICM no help, and the fuel pump as well, with no results, fuel pressure reading @39lbs. book says 25~44. Has anyone changed the cat converter to relieve this problem? If so did this work. Thanks, Mike
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Try cleaning the MAF sensor.

I have the same year, but haven't had it long(~2 months). SO I'm not sure if this car has one though, but on my '92 Q45 that was the cause of the problem you described.

 

yep. try cleaning the Mass air flow sensor.

 

Unless this has been done recently, I would replace the spark plug wires.