I have a 2010 Enclave CXL AWD Has been a Great vehicle since I bought it 3 years ago. Drove it this morning and ran fine. This evening, It would crank, but not fire. on the 4th try fired instantly and ran wide open to 4 - 5000 RPM!. Shut it off and waited a minute. Same thing, starts wide open. Attached my Diagnostic tool and no codes!