i just changed the fuel filter about 3 weeks ago, I have been using a different fuel this week, simply because i haven't been near my usual place that i get it. It is busy truck stop. If that would be the problem how do i get the check engine light to go off? I did drain the filter a couple of times and as soon as i flipped the lever liquid started gushing out. I didn't get a look as to what it looked like since it was dark out. it starts and runs fine but if i mash down on the pedal it will puke a little bit and then clear out. I do notice the tack bobs up and down a little as it idles. It seems around here this time of year i do get crappy fuel a lot no matter where i go. I get a lot of water too and i do run stanadyne in my truck, every time i get fuel i dump some in.
Gary