[Xr6t 03 being temperamental]

I've takin my car to 2 of the top performance shops in my area and neither of them could locate the problem... on top of that they also couldn't find any codes it was throwing... I've paid over $1000 at this point seeking answeres to get nothing in return. 

 

As for symptoms erm now I think about it if I dont have the heater on and im stuck in traffic it will generally happen...  long before this issue it seems to boost cut if you punch it... and it also idles under 1000rpm when you start it and when your stopped in traffic.... 

 

Im honestly not the best at explaining things im sorry 

 

Everything else in the car was done perfessionally years before this issue. 

[Xr6t 03 being temperamental]

Hey
So I have a 03 BA XR6 Turbo and it seems to be having an issue that the mechanics can't seem to find so im coming here in hopes for answeres! 

 

After driving my car for about an hour or 2 it will go into I guess limp mode where I can rev it but it won't physically go anywhere you have to tap the accelerator to go maybe 5km if your lucky!

I changed spark plus coils and it still happened I thought I had fixed it because I managed to drive it for 5 hours but the heater was going and the car wasn't getting to half way then I turned the heater off and about 30 minutes later it did it again so now im thinking a heating problem.. by the time the mechanics get there with a scan tool the car has cooled down and is fine again... its rather annoying because I love my car and have put a fair amount of money and time into it.

Help please?