[caj767314922]

Hey guys my customers have a 94 Silverado Chevy 350 or 5.7 liter, my customers have changed the spark Plugs and fuel filter recently but the engine when my customers put it to the floor will cut out Dearborn DPA5. My customers don't know why this happens; the service engine codes only read a broke EGR valve but all that does is recycle exhaust through the engine. Any ideas? My customers is out of them.