hi guys i just bought a 1998 pontiac bonneville form a dealership last week and i cant get it to run right at all i have tuned it up i have changes the 02 sensor tps and maf its been gettin slighty better cause when i first got it it was horrible but i notice when its runnin and it can be runnintg quiet and its like the lights dim and it idles rough im thinkin it may be a ground or sumthin cause it cant be nuthin else