Got a 1991 buick Century that ran great until it just sputtered and died. I have replaced the fuel filter and some vacuum lines plus on a suggestion I replaced the ignition modual with no results. I have fuel pressure and spark. After sitting over night it ran for a day then died horribly once again and i'm perplexed.I would appreciate any suggestions.


Thanks

Check your EGR valve. This piece is often defect.

check all electrical connections, remove injector plug check for pulse when cranking with 194 bulb. (prongs bent down)

is the catalyitc convertor stock? before this started, did you notice any lose in power?

spark and fuel is what you check first.