My 00 GT just broke 90k miles and I decided it was a good time to replace the spark plugs, the old plugs were motorcraft platinum's and they were gapped between .63 to .72 when I pulled them out 
so I'm guessing they've been in there for awhile, Perhaps they're the original plugs.
I replaced them with the same type (except new ones have longer threads) and left the gap as is, I checked each one and they were all gapped 0.56.
I also installed a JLT Cold air intake and put a bottle of chevron techron fuel system cleaner in my tank, I did all of this in the same week so it's hard to pinpoint if or which one of these caused the issue explained below, also the car ran fine for nearly 2 weeks without any symptoms afterwards, in fact it's running stronger now than it ever has since I bought it (4 1/2 years now).
The problem is for the past few days I have a random miss which starts to occur after the car has warmed up, It's pretty random but when it happens it almost always as Im taking off from a stop, it almost feels as if the whole car is cutting off for a brief second, the check engine light hasn't come on.
At first I thought it was losing a cylinder so I pulled the plugs but they all look brand new still.
I also tried cleaning the 2 prongs on each fuel injector and COP with q-tip & alcohol but that didn't help, the last thing I tried was to verify the MAF was still plugged in properly since it now sits inside the fender, but that checked out ok.
Any other ideas on what I can check would be greatly appreciated. The car is basically stock other than the JLT CAI & Centerforce dual friction clutch.
so I'm guessing they've been in there for awhile, Perhaps they're the original plugs.I replaced them with the same type (except new ones have longer threads) and left the gap as is, I checked each one and they were all gapped 0.56.
I also installed a JLT Cold air intake and put a bottle of chevron techron fuel system cleaner in my tank, I did all of this in the same week so it's hard to pinpoint if or which one of these caused the issue explained below, also the car ran fine for nearly 2 weeks without any symptoms afterwards, in fact it's running stronger now than it ever has since I bought it (4 1/2 years now).
The problem is for the past few days I have a random miss which starts to occur after the car has warmed up, It's pretty random but when it happens it almost always as Im taking off from a stop, it almost feels as if the whole car is cutting off for a brief second, the check engine light hasn't come on.
At first I thought it was losing a cylinder so I pulled the plugs but they all look brand new still.
I also tried cleaning the 2 prongs on each fuel injector and COP with q-tip & alcohol but that didn't help, the last thing I tried was to verify the MAF was still plugged in properly since it now sits inside the fender, but that checked out ok.
Any other ideas on what I can check would be greatly appreciated. The car is basically stock other than the JLT CAI & Centerforce dual friction clutch.
