Sounds like flaring to me. How many miles on it and how was it cared for over the years.

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Eric in Plano,Tx
85 300D 277K overall miles
65K on WVO (2 tank)
Rebuilt Transmission at 245k miles.

96 CE LT1
94 Nissian Hardbody
96 F250 XLT PowerStroke (also runs on WVO)