Do you have booster brakes? Sometimes my 57 will almost kill the engine if you apply the brakes at an idle. IE the booster is taking away my vaccum too quick.
57 GMC LCF 370 55 John Deere 40-W 59 John Deere 430-W 2000 GMC 4x4 56 John Deere 420-W Pix on Photobucket
