engine stutters,looses power on 1991 Honda CRX

my car starts fine,runs fine intermittently after running it for about 15 mi,the engine sometimes stutters,loses power until you floor it. taken it to my garage and to the honda dealer. they have no clue as to whats wrong with it.

Asked by for the 1991 Honda CRX
I would guess that you have an exhaust restriction. Have that checked.
1 more answer
Check the spark plugs for oil leaks. I had this problem before and replaced the valve cover gasket and worked fine.