coltonrausch

Off of a cold start (Doesnt matter if its 100 degrees or 50degrees) i will start to drive and the first time it hits 1500 RPM it will do this bucking (Jumps the RPM's between 1200-2000 during this bucking action) for a few sec's and then go away for the rest of the drive. It idles smooth on the start up and during the rest of the drive. It doesnt shift hard either. It will need to sit for several hours before it will do it again on the next cold start up. It did a it 50% of the time before my 60,000 Maintenance and it went away for 2-3 weeks and is slowly starting to happen again but randomly. I have only had the truck for 5,000 miles.

Anyone had this issue and found what was wrong? Thanks for the help. I'm trying to get a video of it happening to post.

Loki 5.0

Sounds like you are getting bad A/F reading. Air filter or MAF sensor dirty?

gDMJoe

HINT/TIP: You'll find posting in thesection more helpful/appropriate than General F150 Discussion posts.
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coltonrausch

I've cleaned the air filter 3 times in the last 5,000 miles. Its a K&N filter. That was the first thing i did when it happened the first time after i bought it.

coltonrausch

Thanks, new to the forum. I just posted it over there. thanks for the tip.

Loki 5.0

dp

Loki 5.0

I would guess filter oil has contaminated MAF sensor. Seems that there is a link as well as blown turbo diesels with K&N filters. YRMV and of course K&N will dispute this. The stock ford filter will flow all the CFM you will need , so IMO it's not worth the risk. I used to run one , but after seeing light thru the gauze I knew I did not trust it to filter to block everything. it's a fine line between to much oil and not enough.