Comments on: Engine Missfire http://www.theonlinemechanic.com/2008/09/28/engine-missfire/ Mon, 06 Sep 2010 13:28:38 +0000 http://wordpress.org/?v=2.0.6 by: H2S http://www.theonlinemechanic.com/2008/09/28/engine-missfire/#comment-33163 Mon, 02 Feb 2009 23:12:31 +0000 http://www.theonlinemechanic.com/2008/09/28/engine-missfire/#comment-33163 I have replaced all 8 coils and spark plugs 1 by 1 in a day, #4 piston continues to mis-fire, i replaced that 1 coil and plug again, still got the same mis-fire, now the truck starts and only stays running if i hold down the gas pedal to about .5 - 1.5 rpm, if i let go the engine stalls out. I'm out of ideas, any suggestions? <font face="Arial">It is a 1999 ford expedition  5.4  V8  automatic trans. 2 wheel drive.</font> I have replaced all 8 coils and spark plugs 1 by 1 in a day, #4 piston continues to mis-fire, i replaced that 1 coil and plug again, still got the same mis-fire, now the truck starts and only stays running if i hold down the gas pedal to about .5 - 1.5 rpm, if i let go the engine stalls out. I’m out of ideas, any suggestions?

It is a 1999 ford expedition  5.4  V8  automatic trans. 2 wheel drive.

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