08 GT. 80,000 miles. Literally all highway miles. Original plugs. The throttle response is not what it use to be. Almost like a turbo lag. Runs great, other than that. All stock except for cai and Diablo tune 93 octane/K&N CAI

 

Try disconnecting battery for 30 min, resets computer
adaptive learning. Also there is throttle cal, turn on key,
don't start, let chimes and dash to settle down. then
slowly push gas peddle all the way to floor then let up,
5 count each way, you will hear TB motor run, turn key
off, then okay to start.
I do this about once a month, seems to help.
Also after batt disconnect you have to let it relearn
idle, as per owners manual.

 

really? where did you read this.. just curious?

 

Lots of threads on all the differant forums.
Search is your friend.

 

+1 on both accounts. And if those don't resolve it, then reload your tune. After that, clean the TB and replace the fuel filter.

 

Have you done regular maintance? If so what?

 

Actually, just replaced the Ford battery (+ terminal was leaking) and there was no battery in car for at least 2 hours. Doing this did fix the scan on my radio, which for some reason stopped working.

 

Regular maintance consists of oil and filter every 5000 miles, fuel filter at 50,000 and brakes accordingly. No tranny, rearend fluid change. No intake/TB cleaning. What did you have in mind?

 

No tranny, rearend fluid change. No intake/TB cleaning.

Plus some spark plugs.

If it's an automatic I would have it serviced. I know Ford and other companies claim 100k mile longevity for their parts. Yes they will last that long, in reality, they don't perform really good for that long. Transmission fluid gets burnt, filled with moisture, leaks or just disappears somewhere, gear oil goes bad, spark plugs wear and wear until they don't put the same fire out anymore. None of these are neccessarily the cause, but a place to look at.

It could also be a plugged catalitic convertor.

Could be the tune. Tried reflashing it?

All sorts of things it could be. I would start with the easy things first.

 

WOW the throttle cal worked. Not only is the lag gone, but my cold idle improved. Thanks man.