Sounds like my beloved 6.9 F250. It sat 6 months thru the winter, and lit off in 1/2 second after glowing for 5 seconds (yes, I replaced the stock controller with a pushbutton years ago).

Love that truck--

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Nate Stanley
(Currently Benzless)
1985 F-250 6.9l 170K
2009 SCION XB 36.5K
2003 LS430 78K
2012 Kubota B 2320