Acceleration Hesitation

[urbanlegend89]

Hello, i have a 99 Explorer sport 4.0L v6...everything is stock. Just starting about a week ago i have had some problems with it. Around 30-40 Mph when i would give it some acceleration it would hesitate, to where i would be pushing down the peddle and nothing would be happening for about 5 seconds, and then it would kick in and the check engine light would go on. I did get gas the other day from a shell and they were reported to have bad gas in their system (haha). I was thinking it could be the o2 sensor? We did a scan on it, which came up saying Cylinders 4-5-6 were not firing correctly...if any one can help me on this that would be great!

thanks

 

[ThePhoenix]

check your fuel filter...might be time to replace. That happened to me when filter got clogged...maybe by bad gas