I had the same problem with the 74mmMAF when I first installed. I took the 68mmMAF sensor and replaced the 74mmMAF sensor. Problem went away. I do think I had an air leak on the MAF gasket ( the gasket probably was wrinkled. I put a film of lube on it to help it slide on easier. My 06 LTD Roadster is at 211.4 RWHP on the last dyno at Eurocharged Performance.