your main cat might be cloged, you wont get a code for that till the car will barely move,take a vaccum guage and hook it up to manifold vaccum, then hold the engine at 3000 rpm's if the vaccume drops slowly to zero you got a bad cat.
if you dont have a guage i lve in the c-nut if you want to drop by.


98 svt sil/blu 3.0 oval heads full P&P, msds headers,bat kit,2,1/2exhaust 30 inch glasspack and 2 spintech mufflers 14.78@94mph with my mechanical arm i can shift gears in less then a twentieth of a second for sale $7000