9200 throttle loss

hey all, my first post since intro

drive a 2006 9200I with the ISX 435 engine with a 74" (?) single sleeper
just fully serviced while i was on vacation
rides nice, pulls well, 6+ mpg, eats 1 gallon oil every 4k miles

had a problem friday. tooling along pulling an empty and the red stop eng light comes on and i have zero throttle.
no buzzer or yellow warning
pull into the shoulder and notice its still running holding the 600 idle rpm but nothing from the pedal.
all temps and pressure are good.
shut it down and in less then a minute start right up.
for a couple seconds the red light is on after start but no throttle then it kicks in.
run it for about 10 miles then same thing.
run it for about 40 miles same thing.
call shop
coolant level is good
oil level is good
tells me to use criuse control to get it home. works good.
get it to a local shop and his computer doesnt pinpoint it. he thinks its egr related.
im thinking its the throttle positioning sensor on the pedal assembly.

looking for input so the mechanic doesnt start trial and error part install on monday

thanks
SUL

 

thanks for the replies

if it was a house or a motorcycle i'd tear right into it.
but being its not my truck im just trying to expedite the fix.

monday am ill find out what codes logged from the stop eng light and see what he suggests

then ill call the company shop and see what they suggest

my monday load is for late afternoon so i have high hopes

 

Taking the truck to the company shop in north jersey.
I think its either
1) a worn pedal stop
2) needs a tps
3) needs a tps overlay harness

We'll see

 

Got the truck back and put 700 miles on with no issues.
shop replaced the throttle position sensor.
glad I pulled it out of the egr shop

Thanks for the help.