I cleaned T.B. and not M.A.S.

COULD incorrect plugs or not tight enough cause this same symptoms?


Sorry for capital letters, just tired of mechanics who are supposed to know about abnormal and normal variants.


I AM asking because for 100,000 miles this vehicle has not done this self pump air test SO not a normal variant and very noticeable! Only real change are spark plugs.

COULD IT BE PLUGS, NOT RIGHT SIZE,OR TIGHT, LOOSE?