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42,000 miles and has a rough idle it`s been sitting in a garage for 6 months. on 1992 Chevrolet G Series Van (G20)

it knocks on take off and smoothes out some on hte road but still knocks some

did you change all the fluids???

spark plugs?? fuel filter???
is the check engine light on??

Roy
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did you change all the fluids???

spark plugs?? fuel filter???
is the check engine light on??

Roy