5.4L Extremely Rough idle, Shutters when accelerating-HELP!
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5.4L Extremely Rough idle, Shutters when accelerating-HELP!
I have a 98 F-150 with 98,000 miles. Bought it with 50,000 miles and I have never had any trouble until last night on the way home when all of the sudden when I would step on the accelerator it would shutter. When in idle it runs extremely rough, entire truck shakes, but does not die. In park, when I step on the acceletor it shutters in low rpm's then runs fine in high rpm's. Any ides of the the problem?
I grew up around older vehicles that you could work on, and to me it sounds like timing, spark plugs or carb needs adjustment, but with new trucks I need lots of help.
Thank you in advance for the help,
Jason
I grew up around older vehicles that you could work on, and to me it sounds like timing, spark plugs or carb needs adjustment, but with new trucks I need lots of help.
Thank you in advance for the help,
Jason
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Joined: Jan 2005
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Mine did the same thing. Turned out to be the EGR valve. They cost about $75 everywhere I checked. One way to check...remove the EGR vavle and cover the throttle body intake and exhaust tube hole with your hands, while an assistance starts your truck. Make sure you have a good seal to avoid vaccum leaks. If your truck runs fine, you know it is the EGR. Worked for me.
Senior User
Joined: Mar 2004
Posts: 224
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From: Central Ohio
jrode, Many things could give the symptoms you're describing. A coil pack seems unlikely because the engine ran fine as the RPMs picked up. The EGR is likely. A big vacuum leak is likely. I wouldn't run out and buy parts until I knew what it was. If I couldn't determine what it was, I'd get it diagnosed.
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Joined: Apr 2004
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From: Michigan
Try a fuel additive
I was having a very similar problem with my 2001 F250 5.4, I thought my trans was shot for sure. Then a friend suggested putting a fuel system antifreeze and cleaner in the fuel. So I put a bottle of Prestone Cold Start in the tank and the problem cleared up with in 5 miles of driving. I am also going to change the fuel filter tomorrow, and probably plugs as well.
I hope this helps you, Pete
I hope this helps you, Pete
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