I know this topic was covered many times before, but results seem mixed. I recently put a drop in K&N filter to replace my old stock filter. Ever since, I have had pinging and poor MPG. Pinging is really noticable when engine is cold.

I did "clean" the MAF.--still pinging

What else should be attempted? I will try a regiment of Seafoam in oil and gas to see if this helps--any other suggestions???--Thanks




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1997 F-150 4X4 XLT Supercab
Black w/ Gray two tone and flares
5.4L Triton
3.55 LS
Gray interior w/ Captains's chairs
6 CD Changer
285 75 16R BFG's