Originally Posted by zipper06
If it was a totally flat lobe it would be hissing back thru the carb at idle or low rpm something you could definately hear, not to say it's not, a compression check would definately tell that story, what no one has mentioned if a week or broken valve spring, just a thought, because i too have no idea what the problem is without looking at it and investigating it myself.
JMO
Zip.
I thought about that because my car did exactly what his is doing with a broken outer spring but he said all the springs were new and he checked for broken ones.