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104 Posts
My 98 vulcan engine has been dealing with code p1131. We changed both upstream o2 sensors and reset computer. Well after driving about 50 miles service engine light is back on and code p1131 comes back again. When car is cold and u put in gear It idles funky but once warm seems to be better. Could this but the upper intake gasket causing this? I know lower intake gaskets are fine because i have no antifrezze problems. I think upper intake gasket is bad
