93 ssei acceleration hesitation

[93_ssei_owner]

I just bought a 93 Bonneville SSEI with only 78xxx miles on it, and under heavy acceleration, the car hesitates very badly, and it seems to be worse the faster I am going, but runs fine under normal to light acceleration. What should I check and / or replace?
Thanks!

[LMP]

THis condition probably leaves some traces behind...better to begin with reading the codes. I t can be (nost probable) MAFsensor, poor fuel pressure , but also firing problems...so get some codes out first and come back. THis is OBD1 so just jump connectors A and B,
www.avigex.ca/xport/plug.jpg , turn the key on, and read the codes from the CEL light.: 12 will come first, and the n stored codes.

[93_ssei_owner]

Thanks for the quick response, I tried the codes and all I get is 12, over and over.

[LMP]

OK most of the elements I mention before shoulf have thrown an error code, except MAF. When mine started that show about like you describe, trying to overtake was a real challenge....
I would be told it is the fuel pump,the fuel filter, the ignition pack....! While all of the above could have been possible, that was none of that stuff. In fact, I found the MAF sensor to be dirty(and no codes) :
www.avigex.ca/xport/maf.jpg
the key element is a small shiny wire across the intake throat and that was covered by kind of gray claylike material . (my fault: had run it without an air filter for a little while) Used Q tip or artist paintbrush with alcohol to clean it up and all returned to normal.
Cleaning it will cost nothing but 2 drops of alcohol . If not that, always time to look for something else later.