[dcdoug]

Engine - 427FE, Holley 3255-1, ignition coil (no box)

Last night within a mile of leaving work, before the engine was really even hot, my engine started running rough, wouldn't hold a good idle, backfiring on deceleration, etc. (It ran fine on the way to work) Since I was in traffic, I didn't find out if it would idle without dying since I was worried about being able to restart it so I kept the revs up when stopped. Ran better above 3,000 RPM, but still felt like it was misfiring. After driving for about 30 minutes, the problem totally went away and stayed away for the last 10 minutes of the drive.

I don't think the engine was hot enough to suffer from percolation (which does happen to me at times) since it started so early in my drive.

What do you think? Did some little piece of junk get into an air bleed, get hung up on a needle valve? Coil going bad? (seems unlikely since it ran fine later when engine was hot)

Other thoughts of things to look at if it happens again?