2003 buick century while driving service engine light flashes on and off. on 2003 Buick Century

all the gagues fuel speed and temputure bounce up and down

Asked by for the 2003 Buick Century
There are about 2000 codes for this engine, so the best thing to do is to have a Pro level tech diagnose this problem, by scanning the engine/transmission computer while performing a test drive and duplicating the problem.