Hello all,
This is my first time posting and I own a 1998 Ford F150 4x4, 5.4l ext. cab stepside... My truck for the last couple months has had a bad miss in it when driving it and I cannot figure it out. This truck just started doing this after I let it sit for 2 wks while I was out of town.
It runs smooth and fine and does not buck when driving above 2rpm's or so but when it is below 2rpm's then it jumps & bucks a little like it has a miss and feels like it tries to run on 7 cyl. instead of 8... It also does not have as good throttle response when sitting at idle then it use to. And it seems to run a little smoother at night time when it is cooler outside which is wierd.

In the last couple months I have tried to fix it by installing a new set of plugs (which was a big headache), along with testing all of the individual coil packs. I took it to auto zone and they did a diagnostic check for me and it came back as a catalac convertor problem which they think it needs a new set of oxygen sensors.

If anyone out there has had this problem before or knows how to fix this, then please help me out.. Thanks in advance!

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Moved to proper forum.

 

Ooops.. Thanks.

 

When you went to autozone did they give you the codes from the scanner?
When Idling does it want to stall?
is there a chk engine light on?
did you chk all the spk plug boots for cracks and carbon tracking.
Rich

 

Rich I think the code was "bank 1"... No it seems to idle just fine. And no its definitely not the spark plug boots. =( Any other ideas? Im thinking that its definitely some kind of sensor, like maybe the maf or something? But I have know idea at this point.

 

We,I,you need the exact code and we can point you in the right direction .
egr valve
cracked vacum lines
dpfe sensor
Maf sensor
02 sensors
Without the code its sometimes a needle in the the stack situation.

Rich

 

If you have an Advance Auto around they will read your codes and give you a paper with the problem system on it.