When you say run rough what do you mean? Like a dead miss almost like you would have water in your gas. Mine sits alot but the miss is intermitnent. Injectors tend not to like sitting for long periods year after year. I mean 3,000 miles a year average.
K

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1989 420SEL 105575 miles
Pearl Black/Grey

1990 Chevrolet E-Cab C-1500
293,000 miles

1989 Olds Toranado Trofeo'
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