Puff/Miss in exhaust.

[68gmsee]

Originally Posted by SoCalSlaughter

....The spark plugs themselves I havent checked in awhile, I know they are under a year old though. And I havent heard or seen an exhaust leak, i installed new donuts on the manifolds maybe 2 months ago.

Some time back I installed plugs in my truck and shortly afterwards it started a slight miss. I tracked it down to a new defective plug. These days you never know.

Have you also checked for intake leaks?

Unfortunately, there's several things that can cause the miss including distributor itself and/or emission parts. If you can have it diagnosed in a shop, that would be the easiest and fastest, otherwise, you just have to start eliminating.