I'll guess a vacuum leak in the ADD system. Could be EZ fix with $5 - $10 of rubber tubing.


Jeff
96 T100 SR5 4WD Ext Cab, Warn Hubs, HD torsion bars, Bilsteins, Camper Shell, TJM bar, factory 31 x 10.5's, Powertrax No-slip rear, Recaro driver's bucket