Hi!

My mid 90s Lesabre has a very rough idle that gets worse in gear. I had it in the shop a few months ago for a rough idle and they replaced all sorts of things, coils, PROM, wires, plugs, et.c, etc. It was fine one day and the next was like sitting on an overloaded washing machine. The car is driven once a week normally less than 50 miles. Could it be water in the gas?

Thank you!!