Have them check the brake line going to the rear axle where it passes behind the fuel tank on the driverside frame rail. Mine rusted out a few months back & gave the same symptom you describe.
I put the Monroe Reflex shocks on mine & have no complaints. I got them from shockwarehouse.com for about $190. There are quite a few folks that say the Bilsteins work good on our trucks but I can't say cause I've never had them.
Good luck
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2000 F-250 SCLB 2wd 7.3 auto PHP stock-65t-80dd-120race-high idle-no start 4"tb exh, wicked wheel, 3 guages, AIS, coolant filt,
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