i put new plugs in the dam car and the sputtering went away....worked fine for a bit....drove 50 miles....started sputtering again.....i thought it was the coils but i dont think it ever was...wasted $250 on 2 coils.....sputtering went away on the dyno when we replaced the spark plugs also......but its a temporary fix...what would cause it to run great on new plugs and for a bit then start sputtering again?

i'm running the BPR7ES plugs....losing my mind here....gapped the plugs at 26....think it could just be the gapping....the sputtering is comming on around 4500rpm and all the way up...HELP?

 

I wrote you back in your other thread.

 

yes thanks...but the sputtering when away with new plugs