2003 GT spark knocks bad

03_TrueBlue_GT said:

When I first started to notice that the car was spark knocking it was already on the 87 tune...

I have yet to use up this 2nd tank of 93 fuel so I will get 87 from a Shell or Chevron station to see if it still does it...

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Get some Seafoam and run thru the intake by pulling a vacuum line while the engine is running and allow it to burn thru atleast a half bottle and put the other half bottle in the gas tank , this will clean off any carbon build up on the pistons and valves , if its still pinging afterwards you may want to do some datalogging with the SCT tuner and Livelink

I had Bosch Platinum +4's in my car for like a week back when it was stock. It ran horrible so I switched back to copper plugs and it ran great. Also some injector cleaner might help you.