98 Grand Prix GT sputters, but idle is smooth.

Asked by May 30, 2017 at 08:57 AM about the 1998 Pontiac Grand Prix 2 Dr GT Coupe

Question type: Maintenance & Repair

I'm thinking it's bad gas but not sure. Low fuel light
came on, so added some gas. Started to sputter on
acceleration. Added some gumout cleaner and
drove for about 15 mins. The sputtering continues.
Engine sounds smooth under hood, but can hear
sputter/clogging sound from muffler's. Dual
exhaust...sound is louder on passenger side
muffler than driver's side.

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