X's2 on the cat. my buddies GTP had the exact same problem. then i cut off the cat and welded in a straight pipe and put an O2 sim in the harness and bam car started right up and runs like a champ
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1999 Pontiac Grand Prix GTP - 3.2 S/C pulley, DHP v1.0, Short Ram, 180 T-stat, 2.5 Cat back, PEM's, U-bend delete, Res. delete, Autolite 104's, Sprint Springs, RAT swaybars, GMPP trailing arms, GMPP Strut Tower Brace, Debadged, Powdercoated black torquestars, SD Hood.
www.thechicagogarage.org www.ilgpc.com
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