so i put seafoam in my oil gas and brake booster and now i have a stumble at 800-1200 rpm i know what your thinkin o2 sensors or plugs but ive replaced both what else would make it stumble any ideas are helpful thanks

 

i just did the same and was told not to put into oil even though its recommended,now i had a stumble before i sefoam and now its clear no stumbles at all,i suggest you change your oil and and repeat the seafoam and go from there.hope this helps

 

Try changing the fuel filter now

 

If it were due to a fuel filter, the problem would get worse as engine load rises. He only indicated the problem was within a narrow rpm band.

In that range, it is due to EGR problems. Do you still have an EGR? If so disconnect it and plug the vac line and try it again.

If it still persists, pull up the fuel rail and have someone crank it over while you observe each injector spray pattern. Chances are good if you haven't been cleaning the fuel system regularly, the seafoam washed the gunk to the end of the line. The fuel rails.

 

I forgot to mention i did change the fuel filter it ran better after but still the stumble

thats good info about the egr i still have it connected but its all tuned out i guess it could still be a vac leak though?

thats a good idea bout the fuel rails that old fuel filter was real nasty ive only had the car a couple months so i dont know how much maintinance was done i think im gunna try some fuel injecter cleaner whats a good brand to use anyone?

 

Oh and i changed the oil after 150 miles royal purple