i here that some times a alternator that seams good will make the computer throw weird and do weird stuff can you give a break down of your codes and there meaning?

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