11/03/2026
1989 GMC C2500 Sierra 350 V8
Truck would stumble and stall out when accelerating. Did checks with my scope on fuel injectors, that wasn't the issue, did a quick test about the TPS, that wasn't the issue. Checked to see if EGR Valve was working properly. Found Exhaust Pressure Valve Solenoid to be the culprit, applying vacuum to the EGR valve as it was stuck open. Looked inside and looked melted or gunked up. Client was told by several mechanics that it needed multiple parts and many other things.