sounds like replace the key switch time to me

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commercial fisherman diesel in my blood in my boats trucks and Dear old Dad has had me drivin them since i got my first license in 1968
1986 300 SDL 427654
1999 Chevy Crew Cab Dually 225423
1986 300 SDL 287000 Dad's
1987 190 Turbo 158000 Mom's (my inheritance)

Have you determined what car you have?
In my signature, the SD [126] is on the left (white), the CD [123] is on the right (gold).

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83 SD

84 CD