engine running rough 98 Expedition
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New User
Joined: Apr 2008
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engine running rough 98 Expedition
Hi Folks
I just recently acquired a 98 Expedition 5.4 2WD. It had a misfire in Cyl #1 , #5 .It has 195k miles, I did a tune up using Ford spark plugs lugs and replaced all the boots and springs on the coil and replaced 2 bad COP. It runs great when it been sitting for a while or cold and after about 10 minutes of driving it feels like it's stumbling and misfiring running really rough feels like running on 6 or 7 cylinder. No CEL or flashing CEL. Once it's warmed up when you come to a stop and have to step on the gas it feels like you are on the rumble strips, it feels like this every time the gas is depressed. I am running out of ideas. When it's cold it runs flawless, no stumbling or shaking from the engine. Thanx
I just recently acquired a 98 Expedition 5.4 2WD. It had a misfire in Cyl #1 , #5 .It has 195k miles, I did a tune up using Ford spark plugs lugs and replaced all the boots and springs on the coil and replaced 2 bad COP. It runs great when it been sitting for a while or cold and after about 10 minutes of driving it feels like it's stumbling and misfiring running really rough feels like running on 6 or 7 cylinder. No CEL or flashing CEL. Once it's warmed up when you come to a stop and have to step on the gas it feels like you are on the rumble strips, it feels like this every time the gas is depressed. I am running out of ideas. When it's cold it runs flawless, no stumbling or shaking from the engine. Thanx
Senior User
Joined: Jun 2006
Posts: 285
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From: Glendora, CA
As mentioned above, for sure! Check those sensors for starters, could be the temp sensor is reading way off. OH, and don't do as I did...be sure the IAC's wires get snapped all the way back in! 
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New User
Joined: Apr 2008
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well I unplugged the battery, change the fuel filter, added a bottle of octane booster, connect the battery after 30 minutes and everything is fine now, runs smooth and powerful. Jump on the highway and put on about 120 miles. No CEL or stumbles or miss. Thanx everyone for their help.
