I have a '94 4.3L with a z vin. It threw off codes to replace the egr valve and the map sensor. I replaced the map sensor but am feeling nervous with the egr valve. I believe it is 10 mm bolt on it but it feels a little loose. Someone suggested it could be a 9.5 mm but that seems way to odd. I started it up after the map sensor and there is no code, but it is running a little rough.
I'm feeling like I should change the egr valve. Could someone tell me what bolt size that is? I really do not want to strip it and have to use an easy out. Any help would be greatly appreciated.