Check the plugs. I had a prob like that recently with my vette. Check the grounds on the PCM and also check the fuel pump/filter.
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1999 MBM T/A - the new ride 
2004 CE Corvette - 1.410 - 10.246 @ 133.39
2003 Silverado - Lifted 6 on 35s
2000 T/A WS6 - 11.190 @ 119.79...SOLD
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