454 chevy motor problem

I have a 1985 winnebago with a 454 chevy . The exhaust manifold was replaced 300 miles ago . When I started it the other day I blew a spark plug. Now it runs ruff. Ihave replaced plug and plug wire.

C Nash

Senior Member
454 chevy motor problem

Is it skiping on the same cylinder that blew the plug? Easy to crack a plug when installing. Did you gap the plug? Have you checked compression? Might get more answers if you post in general since it is a gasser.
RE: 454 chevy motor problem

You may want to check and make sure no other cylinders are missing as in maybe a burned plug wire on another cylinder besides the one you had a problem with. Heat from the plug wires will burn them if they ever made contact with the manifold at one time and cause that problem.