FWD DeVille 1985-2005, Fleetwood, and 60 Special
I have a 92 Sedan Deville with 137K, occassionally on start up regardless if the engine is cold or warm it sounds like a valve or lifter sticking and at the same time the engine runs rough. After a few minutes of operation the noise will go away and it will run smooth. I put Rislone in it...